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The NCERT chapter 12 Sound discusses the reason how organisms are able to hear in detail. The NCERT Class 9 Science Chapter 12 Notes covers a brief details of the chapter Sound-The main topics covered in Sound- class 9 notes are — production and propagation of sound, medium of sound, description of sound waves, determination of sound in different media, a reflection of sound, echo, reverberation, uses of multiple reflection of sound, hearing range and applications of ultrasound, sonar and structure of human ear.
Also, students can refer,
In our daily life , humans, birds, bells, machines etc produce sounds.
Sound can be defined as a kind of energy that generates a sensation of hearing in our ears. The production of sound is aided by plucking, scratching, rubbing, blowing or shaking any object. Sound is produced by a vibrating body. Human beings produce sound by vibrations in the vocal cords.
Medium is anything which is capable of transmitting a sound. A medium can be any solid, liquid or gas. Sound travels from it's point of generation to the listener via a medium. When an object vibrates it enables the medium particles to vibrate. They do not move from the vibrating object to the ear, instead, one particle comes in contact with the object and gets displaced from its equilibrium position. A force is exerted on the adjacent particle which results in the displacement of this particle which enables the first particle to come back to its initial position. This process is repeated until the sound reaches our ears.
A disturbance that moves through any medium when its particles cause the neighboring particles into motion is called a wave. In turn, they develop similar motions in other particles. The medium particles do not travel forward themselves, instead, the disturbance makes them move forward. This is the mechanism of propagation of sound in a medium, thus the sound can be visualized as a wave. Sound waves are mechanical waves that enable the motion of particles in the medium. The most common medium by which sound travels is the air.
When a vibrating body moves forward, it creates a region of high pressure called compression (C). The air begins to move away from the vibrating object. When this vibrating object moves back, it creates a region of low pressure called rarefaction(R). Thus, air comprises a series of compressions and rarefactions due to the movement of objects backwards and forward rapidly. Thus, sound waves are propagated through the medium.
Pressure = number of particles in the medium / volume.
More density produces more pressure and vice versa.
So, sound propagation can be seen as the propagation of variations in density or variations in pressure in the medium.
Air, water, Steel are the material medium needed by sound to travel and propagate. Sound is unable to travel through a vacuum. Let us understand this through this experiment.
An electric bell and a glass ( airtight ) were taken. The electric bell was hung inside this airtight bell jar which was further connected to a vacuum pump. When the switch was pressed on the sound of the bell was heard. When the air in the jar started pumping out, the sound became lower even though the same current was passing through the bell. Gradually when little air was left inside the bell jar a very weak sound was heard.
Sound waves are longitudinal:
Compressions (C) are the regions where the coins become closer while rarefactions(R) are the regions where the coils become further apart.
Sound travels in a series of compressions and rarefactions in a medium. Sound waves are longitudinal waves where the individual particles of the medium travel in a direction parallel to the direction of propagation of the disturbance. These particles are immovable and cannot travel from one place to another. They oscillate backward and forward about their rest position. This is the property of longitudinal waves and hence sound waves are regarded as longitudinal waves.
Characteristics of a sound wave:
A sound wave is demonstrated by its frequency, amplitude and speed.
The graphical representation of a sound wave shows how density and pressure change whenever the sound wave travels through a medium. The density and pressure at a given time changes with distance above and below the average value of density and pressure. These figures show the variations in density and pressure when a sound wave travels in the medium.
Region of compressions contains the particles present together which is represented by the upper portion of the curve. Peak is known as the region of maximum compression. The density and the pressure is always high in the regions of compressions. The areas of lower pressure where the particles are seen spreading and they are shown by a valley known as rarefactions which is situated in the lower portion of the curve. Crest is the peak of the graph while the valley of the graph is called the trough of a wave.
Wavelength: It means the distance between two consecutive compressions (C) or two consecutive rarefactions (R). is the symbol for wavelength. The SI unit of wavelength is meter(m).
Frequency: is the number of times a body vibrates.
The maximum value of density to its minimum value and then again to its maximum value form one oscillation. The number of oscillations per unit time is the frequency of the sound wave. It is also the number of compressions or rarefactions that cross per unit time. The symbol for frequency is while the SI unit of frequency is hertz(Hz).
Time period: It is the time occupied by two compressions or rarefactions one after the other, to cross a specific point.
t is the time taken for one complete oscillation in the density of the medium. T is the symbol of the time period and its SI unit is second (s).
Relation between frequency and time period:
T= 1/f
Pitch: It is the interpretation of the frequency of an emitted sound.
When the vibration of the source is faster , the frequency and therefore the pitch becomes higher. High pitch represents more compressions and rarefactions passing a fixed point per unit time.
Amplitude( A) : The magnitude of the maximum displacement is called amplitude. The unit of amplitude is the same as the unit of density or pressure. The amplitude determines the loudness or softness of a sound, and depends upon the force with which an object is vibrated. When a sound wave moves away from its source, its amplitude and loudness decreases.
Quality or Timber: It helps us to differentiate one sound from another sound of the same pitch and loudness. Pleasing sound is said to be of rich quality while an unpleasant sound is regarded as noise. Music is soothing to our ears and is of rich quality. A sound of a single frequency is known as a tone while a sound that is developed because of a mixture of many frequencies is called a note.
Speed (S)= Distance/Time = d/T
SI Unit: meter/second (m/s)
Wavelength (λ ) of the sound wave is the distance moved by the sound wave in one time period (T) of the wave.
S= λν
speed = wavelength × frequency
Intensity of sound: It is the amount of sound energy travelling each second through the unit area.
Loudness: It is defined as a measure of the response of the ear to the sound.
The speed of the sound is dependent on the characteristics of the medium through which it propagates/travels.
Speed of sound is dependent on the temperature of the medium. For example the speed of sound reduces when an object is changed from solid to gaseous state.
A table is given which represents the speed of sound in various media.
The reflection of sound occurs at the surface of a solid or liquid. Sound also follows the laws of reflection.
Laws of reflection:
1. The incident ray, the reflected ray and the normal lies in the same plane, that is, the reflecting surface
2. The angle of incidence is always equal to the angle of reflection.
Echo:
When our sound reaches a suitable reflecting object such as a mountain, an echo is heard. It remains for only 0.1 seconds.
Conditions for hearing echo:
1. The time difference(interval) between the original sound and the reflected sound must be at least 0.1 seconds.
2. The minimum distance of the reflecting surface from the source of sound must be 17.2 m.
Due to successive or multiple reflections, echoes are heard again and again. Example- rolling of thunder.
Reverberation:
The sound caused by repeated reflections from a reflecting object is called reverberation.
The roof and walls of a big hall are generally covered by sound-absorbent materials like compressed fiberboard.
Uses of multiple reflection of Sound:
Musical instruments like megaphone and a horn are made up of a tube whichis followed by a conical opening.
It is used in a stethoscope which is used for hearing sounds developed within the body. The sound of the patient’s heartbeat is heard by the doctor’s ears by multiple reflections of sound.
Ceilings of auditoriums are made curved aiming that sound after reflection reaches all corners of the hall.
Range of Hearing:
Audible range of hearing of sound for humans varies from about 20 Hz to 20000 Hz.
That sounds whose frequencies are below 20 Hz are known as infrasonic sounds.
The communication of rhinoceros is done at 5 Hz. Whales and elephants also communicate through infrasonic sounds.
The frequencies which are higher than 20 khz are known as ultrasonic sounds or ultrasounds.
Dolphins and bags produce ultrasounds.
1 Hz equal to one cycle per second
Children who are under the age of 5 and some animals like dogs have the capacity to hear up to 25 kHz
Ultrasounds have frequencies which are capable of travelling every part even in the presence of obstacles. They are mainly used in industries and in the medical sector.
1. These high frequencies clean spiral tubes, electronic components and several other places which are hard to reach. The objects which are needed to be cleaned are put in a cleaning solution and the ultrasonic waves are passed in the solution. Because of the high frequency of these particles, the dust particles and the dirt get removed and the object becomes clean
2. Ultrasonic vibrations are used to find cracks and flaws in metal blocks. These metal blocks are used for construction of buildings and scientific equipment. The floors or the cracks inside these are invisible from outside. It reduces the strength of the buildings and machines. Ultraviolet waves are passed through these metal blocks to cure this and the detectors function to detect the propagated waves. When any small defect is encountered these ultrasound reflects back which indicates the presence of any crack.
3. Ultrasonic waves are used in the technique of echocardiography. This technique makes the ultrasonic waves reflect from various parts of the heart and develop its image.
4. Ultrasonic waves are also used in ultrasound scanners to produce images of internal organs of the human body. It is used to detect any fault in the liver, gallbladder, uterus, etc. The technique by which the images are displayed on a monitor is called ultrasonography.
5. The ultrasonic waves are also used to break small stones formed in the kidneys or liver which get removed with the urine of the individual.
The expanded form of Sonar is Sound navigation and ranging.
It is an instrument which uses the ultrasonic waves to measure the distance, direction and speed of objects inside water.
Working:
Sonar constitutes a transmitter and a detector which are installed in a boat or a ship. Ultrasonic waves are produced and transmitted by the transmitter which travel through water and strike the object on the seabed. The waves are reflected back and are sensed by the detector. The detector converts the waves into electrical signals for interpretation. The object's distance which reflects the sound wave can be measured by determining the speed of sound in water and the time period between transmission and reception of the ultrasound.
If the time interval is t, and the speed of sound is S, the total distance, 2d, travelled by the ultrasound becomes,
2d= S×t
This technique is known as echo ranging.
The Sonar technique is also used in various other determinations to calculate the depths of the sea and to detect the location of underwater hills, submarines, sunken ships, etc.
Ear is an extremely sensitive instrument which aids in hearing. It enables us in conversion of variations in pressure of the air with audible frequencies into the electric signals which transmit to the brain via auditory nerve.
The outer ear is known as pinna which functions to collect the sound from surroundings.
This sound goes through the auditory canal. Eardrum or the tympanic membrane is a thin membrane present at one end of the auditory canal. When the eardrum receives a compression of the medium, an increased pressure is observed on the outside of the membrane which forces the eardrum inward.
In a similar way, during rarefactions, the eardrum moves outward.
The middle ear contains three bones namely, hammer, anvil, and stirrup. These bones amplify the vibrations many times in the middle ear and the middle ear propagates the amplified variations in the pressure received from the sound wave to the inner ear.
The inner ear converts the pressure variations into electrical signals with the help of cochlea. The brain receives the electrical signals via the auditory nerve, and the brain interprets them as sound.
Significance of NCERT notes for class 9 Science chapter 12
The NCERT Notes for Class 9 Science Chapter 12 is very significant for a student. By reading these notes, students will be able to better grasp the knowledge of the contents of this chapter. By revising the notes, students can score more marks in their examinations. They can download these notes for free and can use them for future purposes too.
NCERT Class 9th Science Chapter 12 Notes |
NCERT Class 9th Science Chapter 14 Notes |
Longitudinal
Given,
Frequency, ν = 5 kHz = 5000 Hz
Wavelength, λ = 70 cm = 0.70 m
We know that speed, S of the wave = wavelength × frequency
S = λ ν
= 0.70 m × 5000 Hz = 3500 m/s
Time, T= Distance/Speed
= 5 * 1000/3500
= 1.42 seconds
We know, speed = wavelength × frequency
S= λ ν
λ = S
= 440220
= 2 meters
SONAR stands for Sound Navigation And Ranging.
Hammer, anvil and stirrup
Application Date:20 November,2023 - 19 December,2023
Application Date:20 November,2023 - 19 December,2023
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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.
Production Manager Job Description: A Production Manager is responsible for ensuring smooth running of manufacturing processes in an efficient manner. He or she plans and organises production schedules. The role of Production Manager involves estimation, negotiation on budget and timescales with the clients and managers.
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Quality Assurance Manager Job Description: A QA Manager is an administrative professional responsible for overseeing the activity of the QA department and staff. It involves developing, implementing and maintaining a system that is qualified and reliable for testing to meet specifications of products of organisations as well as development processes.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
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.
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.
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.
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.
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.
ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks.
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
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.
A Cloud Solutions Developer is basically a Software Engineer with specialisation in cloud computing. He or she possesses a solid understanding of cloud systems including their operations, deployment with security and efficiency with no little downtime.
A Customer Relationship Management Technology Consultant or CRM Technology Consultant is responsible for monitoring and providing strategy for performance improvement with logged calls, performance metrics and revenue metrics. His or her role involves accessing data for team meetings, goal setting analytics as well as reporting to executives.
Career as IT Manager requires managing the various aspects of an organization's information technology systems. He or she is responsible for increasing productivity and solving problems related to software and hardware. While this role is typically one of the lower-level positions within an organisation, it comes with responsibilities related to people and ownership of systems.
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