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NCERT Solutions for Class 12 Physics Chapter 12 Atoms: Welcome to the updated atoms ncert solutions class 12. On this Careers360 page, you'll find detailed question-and-answer explanations crafted by subject experts. These class 12 atoms ncert solutions are available in PDF format for students' convenience, enabling access anytime and anywhere according to their preferences.
Do you know that an atom is electrically neutral, which tells that atoms contain an equal number of positive and negative charges. The Atoms Class 12 NCERT Solutions explain questions related to different models of the atom, their drawbacks, hydrogen spectra, and Debroglie hypothesis. CBSE NCERT solutions for Class 12 Physics chapter 12 atoms will help you in board exam preparation. The solutions of NCERT plays a major role in making the concepts easy and hence will help in competitive exams also. The questions in Atoms Class 12 NCERT text book are divided in to exercise and additional exercise. All questions are solved based on the NCERT syllabus.
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Studying NCERT solutions for Class 12 Physics Chapter 12 Atoms is important because it provides a clear and detailed understanding of the questions covered in the chapter. It also helps in preparing for exams like JEE or NEET and understanding the fundamental principles of physics.
Free download class 12 physics atoms ncert solutions pdf for CBSE exam.
NCERT Solutions for Class 12 Physics Chapter 12 Atoms: Exercise Solution
Q 12.1 Choose the correct alternative from the clues given at the end of the each statement:
(a) The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model. (much greater than/no different from/much less than.)
(b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force. (Thomson’s model/ Rutherford’s model.)
(c) A classical atom based on .......... is doomed to collapse. (Thomson’s model/ Rutherford’s model.)
(d) An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in .......... (Thomson’s model/ Rutherford’s model.)
(e) The positively charged part of the atom possesses most of the mass in .......... (Rutherford’s model/both the models.)
Answer:
(a) The size of the atom in Thomson’s model is no different from the atomic size in Rutherford’s model.
(b) In the ground state of Thomson’s model electrons are in stable equilibrium, while in Rutherford’s model electrons always experience a net force.
(c) A classical atom based on Rutherford’s model is doomed to collapse.
(d) An atom has a nearly continuous mass distribution in a Thomson’s model but has a highly non-uniform mass distribution in Rutherford’s model .
(e) The positively charged part of the atom possesses most of the mass in both the models .
Answer:
On repeating the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil we would have different observations than Rutherford, as the alpha particles won't be scattered much because of being heavier than the nucleus of the Hydrogen atom. Therefore we would not be able to confirm the presence of almost the entire mass of the atom at its centre.
Q 12.3 What is the shortest wavelength present in the Paschen series of spectral lines?
Answer:
The Rydberg's formula for the hydrogen atom is
Where R is Rydberg constant for the Hydrogen atom and equals to 1.1 10 7 m -1
For shortest wavelength in Paschen Series n 1 =2 and n 2 =
The shortest wavelength in Paschen Series is therefore 818 nm.
Answer:
Frequency of radiation consisting of photons of energy E is given by
E=2.3 eV
Plank's constant(h)=6.62 10 -34 Js
Answer:
The ground state energy E=-13.6 eV.
The kinetic energy= -E=13.6 eV
Also ground state energy = Kinetic energy+Potential energy
E=K+U
U=E-K
U=-13.6-13.6
U=-27.2 eV
The kinetic and potential energies are 13.6 eV and -27.2 eV respectively.
Answer:
The initial energy of the electron is E 1
E 1 =-13.6 eV
The energy of the electron when it is excited to level n=4 is E 2
E 2 =-0.85 eV
The difference between these two energy levels is equal to the energy of the photon absorbed by the electron.
The energy of the photon E = E 2 - E 1
E = -0.85 -(-13.6)
E = 12.75 eV
The wavelength of the photon can be calculated using relation
hc=1240 eV
The wavelength and frequency of the photon absorbed by the hydrogen atom are 98.6 nm and 3.04 10 15 Hz respectively.
Answer:
As per Bohr's model the angular momentum of electrons in each orbit is constant and a multiple of
(i)
The electrostatic force of attraction between the electron and the nucleus provides the required centripetal force for the circular motion of the electron.
(ii)
Using equation (i) and (ii) we get
v 1 =2.18 10 6 ms -1
v 2 =1.09 10 6 ms -1
v 3 =7.28 10 5 ms -1
(b) calculate the orbital period in each of these levels.
Answer:
Orbital period (T n ) is defined as time taken by the electron to complete one revolution around the nucleus and is given by
T 1 =1.53 10 -16 s
T 2 =1.22 10 -15 s
T3=4.12 10 -15 s
Answer:
The radius of the orbit is proportional to the square of n.
For n=2 the radius of the orbit is
For n=3 the radius of the orbit is
Answer:
Since the energy of the electron beam is 12.5 eV the Hydrogen atoms will get excited to all requiring energy equal to or less than 12.5 eV
E 1 =-13.6 eV
E 3 = -1.5 eV
E 3 -E 1 = 12.1 eV
E 4 = -0.85 eV
E 4 -E 1 =12.75 eV
Therefore the electron can reach maximum upto the level n=3.
During de-excitations, the electron can jump directly from n=3 to n=1 or it can first jump from n=3 to n=2 and then from n=2 to n=1
Therefore two wavelengths from the Lyman series and one from the Balmer series will be emitted
To find the wavelengths emitted we will use the Rydberg's Formula
where R is the Rydberg's constant and equals 1.097 10 7 m -1
For n 1 =1 and n 2 =3
Emitted wavelength is 102.5 nm
For n 1 =1 and n 2 =2
Emitted wavelength is 121.54 nm
For n 1 =2 and n 2 =3
Emitted wavelength is 656.3 nm
Answer:
As per the Bohr's model, the angular of the Earth will be quantized and will be a multiple of
n = 2.56 10 74
Therefore the quantum number that characterises the earth’s revolution around the sun in an orbit of radius m with an orbital speed
is 2.56 10 74
Is the average angle of deflection of -particles by a thin gold foil predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?
Answer:
The average angle of deflection of -particles by a thin gold foil predicted by both the models is about the same.
Is the probability of backward scattering (i.e., scattering of -particles at angles greater than ) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?
Answer:
The probability of backward scattering predicted by Thomson’s model is much less than that predicted by Rutherford’s model.
Keeping other factors fixed, it is found experimentally that for small thickness t, the number of -particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?
Answer:
Scattering at moderate angles requires head-on collision the probability of which increases with the number of target atoms in the path of -particles which increases linearly with the thickness of the gold foil and therefore the linear dependence between the number of -particles scattered at a moderate angle and the thickness t of the gold foil.
In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of -particles by a thin foil?
Answer:
It is completely wrong to ignore multiple scattering for the calculation of the average angle of scattering of -particles by a thin foil in Thomson's model as the deflection caused by a single collision in this model is very small.
Answer:
As per the bohrs model
(i)
If the proton and the electron were bound only by the gravity the gravitational force between them will provide the centripetal force required for circular motion
(ii)
From equation (i) and (ii) we can calculate that the radius of the ground state (for n=1) will be
The above value is larger in order than the diameter of the observable universe. This shows how much weak the gravitational forces of attraction as compared to electrostatic forces.
Answer:
Using Bohr's model we have.
Since n is very large 2n-1 can be taken as 2n and n-1 as n
The frequency of the emission caused by de-excitation from n to n-1 would be
The classical frequency of revolution of the electron in the nth orbit is given by
The above is the same as the frequency of the emission during de-excitation from n to n-1.
(a) construct a quantity with the dimensions of length from the fundamental constants e, me, and c. Determine its numerical value.
Answer:
Using dimensional analysis we can see that the quantity to be constructed and consisting of m e , e and c will also have and will be equal to
and has numerical value 3.5 10 -14 which is much smaller than the order of atomic radii.
(b) You will find that the length obtained in (a) is many orders of magnitude smaller than the atomic dimensions. Further, it involves c. But energies of atoms are mostly in non-relativistic domain where c is not expected to play any role. This is what may have suggested Bohr to discard c and look for ‘something else’ to get the right atomic size. Now, the Planck’s constant h had already made its appearance elsewhere. Bohr’s great insight lay in recognising that h, me, and e will yield the right atomic size. Construct a quantity with the dimension of length from h, me, and e and confirm that its numerical value has indeed the correct order of magnitude.
Answer:
Using dimensional analysis we can see that the quantity to be constructed and consisting of m e , e and h will also have and will be equal to
and has a numerical value of approximately 6.657 10 -10 which is about the order of atomic radii.
Q 12.15 (a) The total energy of an electron in the first excited state of the hydrogen atom is about –3.4 eV.
What is the kinetic energy of the electron in this state?
Answer:
Since we know that kinetic energy is equal to the negative of the total energy
K=-E
K=-(-3.4)
K=3.4 eV
Q 12.15 (b) The total energy of an electron in the first excited state of the hydrogen atom is about –3.4 eV.
What is the potential energy of the electron in this state?
Answer:
Total Energy= Potential energy + Kinetic Energy
E=U+K
U=E-K
U=-3.4-3.4
U=-6.8 eV
Q 12.15 (c) The total energy of an electron in the first excited state of the hydrogen atom is about - 3.4eV.
Which of the answers above would change if the choice of the zero of potential energy is changed?
Answer:
The total energy would change if the choice of the zero of potential energy is changed.
Answer:
We never speak of Bohr's quantization postulate while studying planetary motion or even motion of other macroscopic objects because they have angular momentum very large relative to the value of h. In fact, their angular momentum is so large as compared to the value of h that the angular momentum of the earth has a quantum number of order 10 70 . Therefore the angular momentum of such large objects is taken to be continuous rather than quantized.
Answer:
As per Bohr's quantization postulate
Similarly, like the case in a simple hydrogen atom, the electrostatic force acts centripetally
From the above relations, we can see that in Bohr's model the Radius is inversely proportional to the mass of the orbiting body and Energy is directly proportional to the mass of the orbiting body.
In case of hydrogen, atom r 1 is 5.3 10 -11 m
Therefore in case of a muonic hydrogen atom
r 1 = 2.56 10 -13 m
In case of the hydrogen atom, E 1 is -13.6 eV
Therefore in case of a muonic hydrogen atom
E 1 =207 (-13.6)
E 1 =2.81 keV
Atoms Class 12 comes under the unit Modern Physics. There are a seventeen questions discussed in the NCERT solutions for Class 12 Physics Class 12 Chapter 12 Atoms. Some of the important formulas of the chapter atoms which will help in NCERT solutions for class 12 physics are given below.
Where n is the quantum number
The total energy of the electron in the stationary states of the hydrogen atom in electronvolt is given by
Another important formula in NCERT is the
De Broglie wavelength
Where ‘h’ is Planck's constant and mv is the momentum. This relation can be modified in terms of the kinetic energy of the particle. Try to derive it yourself.
For CBSE board exam on an average 3 to 4 marks questions are asked from the chapter Atoms. The solutions of NCERT Class 12 Physics chapter 12 Atoms will help in securing full marks in board exam for this chapter. As far as the NEET exam is considered up to 2 questions are expected from the chapter Atoms Class 12 Physics. The NCERT solutions for Class 12 Physics chapter 12 atoms will also help to perform better in exams like JEE Main and other competitive exams.
De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation
Alpha-Particle Scattering and Rutherford’s Nuclear Model of Atom
Alpha-particle Trajectory
X-rays
Bohr Model of the Hydrogen Atom
The Line Spectra of the Hydrogen Atom
These topics are the main focus of the NCERT textbook and are likely to be given more emphasis in exams.
In-Depth Coverage: These atoms ncert solutions class 12 comprehensively address all the topics and questions found in Chapter 12, ensuring a thorough grasp of atomic physics concepts.
Elaborate Explanations: Each class 12 atoms ncert solutions provides comprehensive, step-by-step explanations, making intricate ideas accessible to students.
Clear and Simple Language: The class 12 physics atoms ncert solutions are articulated in plain and straightforward language, guaranteeing easy comprehension.
Practice Opportunities: Class 12 physics ch 12 ncert solutions are included for practice and self-assessment, enhancing students' problem-solving skills.
Exam Readiness: These atoms physics class 12 ncert solutions are vital for board exam preparation and offer invaluable assistance for competitive exams.
Foundation for Advanced Studies: The concepts explored in this chapter establish the groundwork for more advanced studies in atomic physics and related fields.
Open Access: These atoms chapter class 12 ncert solutions are freely accessible, ensuring accessibility for all students.
These distinguishing features render Class 12 Physics Chapter 12 NCERT solutions an indispensable resource for students, facilitating their success in examinations and future academic endeavors.
One or two questions are usually asked in the CBSE board exams from Class 12 chapter Atoms. It can be a 2 or 3 mark question. Students should cover all the concepts of the Class 12 chapter Atoms. The question may be theoretical, numerical or derivations. The syllabus of CBSE board is based on the NCERT book. Students can practice questions based on NCERT syllabus for the board exam.
The Class 12 Physics chapter Atoms are important for both engineering and medical exams. At least one question can be expected from Atoms for both JEE Main and NEET.
The Hydrogen spectrum, Energy of atoms, Bhor Model of Atom, Bhor Postulates etc are important topics of the Atoms Class 12 Physics Chapter. More questions related to these topics an be practiced from NCERT Exemplar for Class 12 Physics.
class 12 physics atom is important for NEET because it forms the foundation of many important concepts in chemistry and physics, including atomic structure, quantum mechanics, wave-particle duality, chemical bonding, and the properties of chemical compounds.
Atomic spectra refer to the unique set of lines or bands emitted or absorbed by an atom when it is excited, they are used to identify elements and study the properties of atoms and their electronic structure. The study of atomic spectra is known as spectroscopy.
Hello aspirant,
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Thank you
Hope this information helps you.
hello,
Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.
I hope this was helpful!
Good Luck
Hello dear,
If you was not able to clear 1st compartment and now you giving second compartment so YES, you can go for your improvement exam next year but if a student receives an improvement, they are given the opportunity to retake the boards as a private candidate the following year, but there are some requirements. First, the student must pass all of their subjects; if they received a compartment in any subject, they must then pass the compartment exam before being eligible for the improvement.
As you can registered yourself as private candidate for giving your improvement exam of 12 standard CBSE(Central Board of Secondary Education).For that you have to wait for a whole year which is bit difficult for you.
Positive side of waiting for whole year is you have a whole year to preparing yourself for your examination. You have no distraction or something which may causes your failure in the exams. In whole year you have to stay focused on your 12 standard examination for doing well in it. By this you get a highest marks as a comparison of others.
Believe in Yourself! You can make anything happen
All the very best.
Hello Student,
I appreciate your Interest in education. See the improvement is not restricted to one subject or multiple subjects and we cannot say if improvement in one subject in one year leads to improvement in more subjects in coming year.
You just need to have a revision of all subjects what you have completed in the school. have a revision and practice of subjects and concepts helps you better.
All the best.
Hi,
You just need to give the exams for the concerned two subjects in which you have got RT. There is no need to give exam for all of your subjects, you can just fill the form for the two subjects only.
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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.
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.
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.
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.
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.
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.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
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.
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.
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.
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.
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.
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.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
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.
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.
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.
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
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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