NCERT Exemplar Class 9 Science Solutions Chapter 12 Sound

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# NCERT Exemplar Class 9 Science Solutions Chapter 12 Sound

Edited By Safeer PP | Updated on Sep 01, 2022 05:38 PM IST

NCERT exemplar Class 9 Science solutions chapter 12 involves learning about sound and how it propagates. It will be useful whether the student is preparing for IIT JEE Main or NEET. The NCERT exemplar Class 9 Science solutions chapter 12 are designed by our Physics department at Careers 360 which holds a team of highly experienced subject experts of NCERT Class 9 Science. These exemplars of NCERT are prepared such that the students receive the best learning flow for the concepts of work and energy. The NCERT exemplar Class 9 Science solutions chapter 12 follows the CBSE Syllabus for Class 9 as a baseline.

## NCERT Exemplar Class 9 Science Solutions Chapter 12-MCQ

Question:1

Note is a sound
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) Always unpleasant to listen

Solution:
Sound of a single frequency is called tone.
Sound of mixture of multiple frequencies is called note.
This mixture may have more than two frequencies.
Frequency of sound is also known as pitch.
Frequency depends on the structure of a sound producing device.
That is why, it is said that frequency depends on the source of the sound.
The correct answer of this question is A.

Question:2

A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected

Solution:
Frequency of sound depends on the mechanical structure of sound producing device.
Different keys of piano will produced sound of different frequency. A single key will always produce sound of same frequency. If we strike the key with force, the frequency will not change but amplitude of sound will change and it will lead to change in loudness.
Frequency is also known as pitch, so we can say if we struck harder the sound will be louder but pitch will be same.
Hence the correct option is option A

Question:3

In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(d) audible sound waves

Solution:
Sonar is the navigation technique used to navigate the location of submarine underwater and it uses Ultrasonic waves.

Question:4

Sound travels in air if
(a) Particles of medium travel from one place to another
(b) There is no moisture in the atmosphere
(c) Disturbance moves
(d) Both particles as well as disturbance travel from one place to another.

Solution:
When sound travels in a medium, molecules of medium does not go from one place to another.
The disturbance due to sound is transferred from one molecule to another, hence we can say disturbance travels when sound travels.
In presence of moisture, the speed of sound in air increases. Therefore, sound can certainly travel in moist atmosphere.
Hence the correct answer of this question is option C

Question:5

When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength

Solution:
Generally sound is characterized by its pitch and loudness.
Pitch is frequency of sound, which tells us number of oscillations, any particle will make in one second.
$f=\frac{1}{T}$
The loudness represent energy or intensity of the sound.
It is generally governed by the fact that how far a particle moves in its oscillation.
This maximum displacement of the particle in oscillation is called amplitude.
So loudness increases means amplitude of oscillation increases.
Hence the correct answer of this question is option B

Question:6

In the curve (Fig.12.1) half the wavelength is
(a) A B
(b) B D
(c) D E
(d) A E

Solution:
Distance between two consecutive crests or consecutive troughs is equal to wavelength of any sound.
In the given figure, the separation between A and E will be equal to one wavelength.
Therefore, half wave length will be equal to AC or CE or BD distance.
Hence, the correct answer of this question is option B

Question:7

Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Solution:
Earthquake produces Seismic waves before the main shock wave.
The Seismic waves have frequency less than 10 Hz.
This frequency is less than audible range and it is called infra sound or infrasonic wave.
The sound of frequency more than that of audible range is called ultrasound or ultrasonic waves.
Sound of frequency less than 20 Hz is called infrasonic and a frequency more than 20,000 Hz is called ultrasonic.
The correct answer of this question is option B

Question:8

Infra sound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings

Solution:
The frequency range, which human being can hear is called audible sound.
Sound of frequency less than 20 Hz is called infrasonic and a frequency more than 20,000 Hz is called ultrasonic.
Rhinoceros can sense sound of frequency less than audible range which is called infra sound.
The correct answer of this question is option C.

Question:9

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting:
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical instruments
(d) loudness of sound

Solution:
The frequency of sound generated from the string, depends on the length of the string, the tension in the string as well as thickness of the string.
Hence, by adjusting the strings of sitar, the Sitarist adjusts frequency with other musical instruments.
Loudness, intensity or amplitude all represent the same physical phenomenon and it depends on how hard you strike the string.
Hence the correct option is option C

## NCERT Exemplar Class 9 Science Solutions Chapter 12-Short Answer

Question:10

In propagation of sound, the particle of medium oscillates.
By the graph, we can see that a time period of one complete oscillation is to 2 microseconds.
The wavelength of disturbance is defined as: distance travelled by disturbance in one time period of oscillation.
$\lambda=V\times T$
or
$\lambda=\frac{V}{f}$
As the disturbance is moving with 1500 m/s and time period is 2 microseconds, The wavelength can be calculated as:
$\lambda=V\times T =1500 \times 2 \times 10^{-6}=3 \times 10^{-3}=3mm$

Question:11

The difference between human male voice and female voice is on the basis of pitch or frequency.
Male voice will have lower frequency in comparison with female voice.
We know that frequency is inverse of time period of oscillation.
$f=\frac{1}{T}$
In the given graph, it is quite visible that time period of graph (a) is more than time period of graph (b).
Therefore graph (a) must be corresponding to male voice.

Question:12

A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.

When we observe a sound directly or after reflection from any building, we call it an echo.
This echo can be heard or these two sounds can be distinguished, only if time gap between them is more than 0.1 second.
For this, separation between source and the wall must be more than 16 meter.
Assuming speed of sound = 320m/s
Distance between source and wall is d, then time to reach reflected sound will be:
$t=\frac{2d}{V}$
In the given case, the size of park is small. Therefore, it cannot cause any echo of the sound produced on the road.

Question:13

Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

The human ear can sense sound only if its frequency is more than 20 Hz and less than 20,000 Hz.
Sound of frequency less than 20 Hz is called infrasonic and a frequency more than 20,000 Hz is called ultrasonic.
The frequency of the disturbance created by humming bee is more than 20 Hz that’s why we can hear the sound.
Due to the vibration of pendulum, the frequency of disturbance is less than 20 Hz and we cannot listen the sound of vibration of pendulum.

Question:14

If any explosion takes place at the bottom of a lake. Infra sound type of shock waves in water will take place?

Transverse wave cannot travel in air or within the water.
Transverse wave can only travel at the surface of water or in solids.
So when any explosion takes place at the bottom of lake, the shock waves have to travel within the water.
These shock waves cannot be transverse and they have to be longitudinal waves like sound wave.

Question:15

Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340 m s–1.)

The speed of light is very large in comparison with the speed of sound.
We can assume that lightning can be seen, without any time delay as light travels very fast.
If the sound produced by thunderstorm is heard 10 seconds after lightning that means sound took 10 seconds to reach from thundercloud.
As the speed of sound is 340 m/s, so distance travelled by sound in 10 seconds will be 3400 meters.
So the approximate distance of thunder cloud is 3.4 km.

Question:16

Similar to light, sound also follows law of reflection.
If I sound is coming at an incident angle of $\angle i$ then it will go at the same reflection angle $\angle i=\angle r$.
In the given question, sound coming through the first pipe has angle of incidence equal to 40° that can be calculated as (90° - 50°)
The same sound will be reflected at an angle of 40°. Therefore, the second pipe has to be kept at the angle of 40° from normal.
Therefore the value of x will be 40°.

Question:17

Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?

The design of ceiling and wall in a good conference hall is to ensure proper sound at every seat of the conference hall.
This design is called acoustic design and design engineers are called acoustic engineers.
The ceiling and wall behind the stage are made curved, so that the reflected sound from them can reach to the audience evenly.

## NCERT Exemplar Class 9 Science Solutions Chapter 12-Long Answer

Question:18

Represent graphically by two separate diagrams in each case
(a) Two sound waves having the same amplitude but different frequencies?
(b) Two sound waves having the same frequency but different amplitudes.
(c) Two sound waves having different amplitudes and also different wavelengths.

In propagation of sound, the particle of medium oscillates.
The time to complete one oscillation is called time period T.
Pitch is frequency of sound, which tells us number of oscillations, any particle will make in one second.
$f=\frac{1}{T}$
Distance between two consecutive crests or consecutive troughs is equal to wavelength of any sound.
By these information, we can draw the corresponding graphs.

Question:19

Establish the relationship between speed of sound, its wavelength and frequency. If velocity of sound in air is 340 m s–1, calculate
(i) Wavelength when frequency is 256 Hz.
(ii) Frequency when wavelength is 0.85 m.

The wavelength of any sound is defined as distance travelled by disturbance in one time period of the oscillation of particle.
$\lambda=V \times T$
The number of oscillations per unit time is called frequency. Hence, frequency and time period are related as.
$f=\frac{1}{T}$
By putting the value of time period in the relation of wavelength, we will get:
$\lambda =\frac{V}{f}\Rightarrow V=f \times \lambda$
i) If frequency and sound velocity is given, wavelength can be calculated as:
$\lambda =\frac{V}{f}\\ \Rightarrow \lambda =\frac{340}{256}=1.328125m$
ii) If wavelength and sound velocity is given, frequency of sound can be calculated as:
$f=\frac{V}{\lambda }\\ \Rightarrow f =\frac{340}{0.85}=400Hz$

Question:20

Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also define wavelengths and time period using this curve.

In propagation of sound, the particle of medium oscillate.
The time to complete one oscillation is called time period T.
Pitch is frequency of sound, which tells us number of oscillations, any particle will make in one second.
$f=\frac{1}{T}$
Distance between two consecutive crest or consecutive troughs is equal to wavelength of any sound.

## NCERT Exemplar Class 9 Science Solutions Chapter 12 Important Topics:

Topics covered in the chapter via Class 9 science NCERT exemplar chapter 12 solution are:

• The student will learn about parameters of a sound wave such as wavelength and frequency.
• Student will learn that sound cannot be propagated in vacuum and travels faster in water than in air.
• NCERT exemplar Class 9 Science solutions chapter 12 discusses the representation of sound in form of graphs is taught in this chapter.
• Students will learn about “crest and trough” and similarly learn about compression and rarefaction zone.

## NCERT Class 9 Science Exemplar Solutions for Other Chapters:

 Chapter wise solutions Chapter 1 Matter in our Surroundings Chapter 2 Is Matter Around Us Pure? Chapter 3 Atoms and Molecules Chapter 4 Structure of the Atom Chapter 5 The Fundamental Unit of Life Chapter 6 Tissues Chapter 7 Diversity in Living Organisms Chapter 8 Motion Chapter 9 Forces and Laws of Motion Chapter 10 Gravitation Chapter 11 Work and Energy Chapter 13 Why do We Fall ill? Chapter 14 Natural Resources Chapter 15 Improvement in Food Resources

## Features of NCERT Exemplar Class 9 Science Solutions Chapter 12:

These class 9 science NCERT exemplar chapter 12 solutions provide the basic understanding of sound and how it propagates. The learning of this chapter will be very useful in higher classes of CBSE or in competitive exams like IIT-JEE and NEET. These NCERT exemplar Class 9 Science solutions chapter 12 can be strategically used to study and practice the concepts of sound and are sufficient to prepare a student to take on other books such as NCERT Class 9 Science TextBook, S. Chand et cetera.

Check NCERT Solutions for questions given in the book

### Check the Solutions of Questions Given in the Book

 Chapter No. Chapter Name Chapter 1 Matter in Our Surroundings Chapter 2 Is Matter Around Us Pure Chapter 3 Atoms and Molecules Chapter 4 Structure of The Atom Chapter 5 The Fundamental Unit of Life Chapter 6 Tissues Chapter 7 Diversity in Living Organisms Chapter 8 Motion Chapter 9 Force and Laws of Motion Chapter 10 Gravitation Chapter 11 Work and Energy Chapter 12 Sound Chapter 13 Why Do We Fall ill? Chapter 14 Natural Resources Chapter 15 Improvement in Food Resources

### Also Check NCERT Books and NCERT Syllabus here

1. Q1. “Frequency is identification of any sound”. comment on the statement.

A1. When sound travels and changes medium, the speed of sound changes. It causes a change in wavelength but not the frequency. Frequency does not depend on the medium.

2. Q2. If a person will shout, does that mean the frequency of sound is increased?

A2. No, the frequency of sound produced by any woman does not change on changing the loudness. The intensity of sound increases on shouting but the frequency of sound will remain the same. Frequency is generally known as pitch which can be seen as identification of someone’s voice

3. Q3. Can we talk on the moon?

A3. No, sound needs medium to travel and there is no atmosphere on the moon. Therefore, we cannot talk on the moon as we talk on earth.

4. Q4. What is the procedure to view the NCERT Exemplar Class 9 Science solutions chapter 12 in an offline environment?

A4. NCERT exemplar Class 9 Science solutions chapter 12 pdf download provides the link to download or view the solutions for NCERT exemplar Class 9 Science chapter 12 in an offline scenario.

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Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.

A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.

3 Jobs Available
##### Multimedia Specialist

A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.

2 Jobs Available
##### Producer

An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.

They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.

2 Jobs Available
##### Fashion Blogger

Fashion bloggers use multiple social media platforms to recommend or share ideas related to fashion. A fashion blogger is a person who writes about fashion, publishes pictures of outfits, jewellery, accessories. Fashion blogger works as a model, journalist, and a stylist in the fashion industry. In current fashion times, these bloggers have crossed into becoming a star in fashion magazines, commercials, or campaigns.

2 Jobs Available
##### Photographer

Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.

2 Jobs Available
##### Copy Writer

In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.

5 Jobs Available
##### Editor

Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

3 Jobs Available
##### Journalist

Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.

3 Jobs Available
##### Publisher

For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.

3 Jobs Available
##### Vlogger

In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.

Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.

3 Jobs Available
##### Travel Journalist

The career of a travel journalist is full of passion, excitement and responsibility. Journalism as a career could be challenging at times, but if you're someone who has been genuinely enthusiastic about all this, then it is the best decision for you. Travel journalism jobs are all about insightful, artfully written, informative narratives designed to cover the travel industry. Travel Journalist is someone who explores, gathers and presents information as a news article.

2 Jobs Available
##### SEO Analyst

An SEO Analyst is a web professional who is proficient in the implementation of SEO strategies to target more keywords to improve the reach of the content on search engines. He or she provides support to acquire the goals and success of the client’s campaigns.

2 Jobs Available
##### Welding Engineer

Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.

5 Jobs Available
##### Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.

3 Jobs Available
##### Quality Controller

A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.

A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

3 Jobs Available
##### Reliability Engineer

Are you searching for a Reliability Engineer job description? A Reliability Engineer is responsible for ensuring long lasting and high quality products. He or she ensures that materials, manufacturing equipment, components and processes are error free. A Reliability Engineer role comes with the responsibility of minimising risks and effectiveness of processes and equipment.

2 Jobs Available
##### Safety Manager

A Safety Manager is a professional responsible for employee’s safety at work. He or she plans, implements and oversees the company’s employee safety. A Safety Manager ensures compliance and adherence to Occupational Health and Safety (OHS) guidelines.

2 Jobs Available
##### Corporate Executive

Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

2 Jobs Available

An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.

4 Jobs Available
##### AWS Solution Architect

An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.

4 Jobs Available
##### Computer Programmer

Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

3 Jobs Available
##### Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.

3 Jobs Available
##### Information Security Manager

Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack

3 Jobs Available
##### Big Data Analytics Engineer

Big Data Analytics Engineer Job Description: A Big Data Analytics Engineer is responsible for collecting data from various sources. He or she has to sort the organised and chaotic data to find out patterns. The role of Big Data Engineer involves converting messy information into useful data that is clean, accurate and actionable.

2 Jobs Available