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NCERT Exemplar Class 12 Physics solutions chapter 11 contains a lot of topics in detail and gives a broader spectrum towards the dual nature of electromagnetic waves, and also gives an insight on different experiments conducted for proving such dual nature of electromagnetic waves. NCERT Exemplar Class 12 Physics chapter 11 solutions defines electromagnetic waves as a combination of packet or bundle of energy or quanta known as photons along with a brief description of photons, and its characteristics. It also explains the phenomenon of electron emission, work function, etc. Class 12 Physics NCERT Exemplar solutions chapter 11 provided here are very useful from an exam point of view. NCERT Exemplar Class 12 Physics solutions chapter 11 PDF download can also be brought into use.
Also see - NCERT Solutions for Class 12 Physics
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Question:2
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly
a) 1.2 nm (b) 1.2 x 10-3 nm
(c) 1.2 x 10-6 nm (d). 1.2 x 10 nm
Answer:
The answer is the option (b)Question:3
Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber. Then
(a) no electrons will be emitted as only photons can emit electrons
(b) electrons can be emitted but all with an energy, E0
(c) electrons can be emitted with any energy, with a maximum of E0 – ( is the work function)
(d) electrons can be emitted with any energy, with a maximum of E0
Answer:
The answer is the option (d) When a beam of electrons (each electron with energy E0 ) incident on a metal surface is kept in an evacuated chamber, energy of incident electrons will be transferred to the emitted electrons due to elastic collisions. A part of E0 of incident electrons is consumed against work function to emit the electrons. Thus, the maximum energy of emitted electrons is E0Question:4
Consider Fig. 11.7 in the NCERT textbook of physics for Class XII. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ that
(a) will be larger than the earlier value
(b) will be the same as the earlier value
(c) will be less than the earlier value
(d) will depend on the target
Answer:
The answer is the option (c)Question:6
An electron is moving with an initial velocity v = v0i and is in a magnetic field B = B0j. Then, its de-Broglie wavelength
(a) remains constant
(b) increases with time
(c) decreases with time
(d) increases and decreases periodically
Answer:
The answer is the option (a)Question:7
Answer:
The answer is the option (a)Question:10
Two particles A1 and A2 of masses m1, m2 (m1 > m2) have the same de Broglie wavelength. Then
(a) their momenta are the same
(b) their energies are the same
(c) energy of A1 is less than the energy of A2
(d) energy of A1 is more than the energy of A2
Answer:
The answer is the option (a. c)Question:11
The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is ve = c/100. Then
(a) Ee/Ep = 10-4
(b) Ee/Ep = 10-2
(c) Pe/mec = 10-2
(d) Pe/mec = 10-4
Answer:
The answer is the option (b,c)Question:12
Photons absorbed in the matter are converted to heat. A source emitting n photon/sec of frequency ν is used to convert 1kg of ice at 0°C to water at 0°C. Then, the time T taken for the conversion
(a) decreases with increasing n, with ν fixed
(b) decreases with n fixed, ν increasing
(c) remains constant with n and ν changing such that nν = constant
(d) increases when the product nν increases
Answer:
The answer is the option (a, b. c).Question:13
A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de-BrOglie wavelength of the particle varies cyclically between two values with Which of the following statements are true?
(a) The particle could be moving in a circular orbit with origin as centre
(b) The particle could be moving in an elliptic orbit with origin as its focus
(c) When the de-Broglie wavetength is the particle is nearer the origin than when its value is
(d) When the de-Broglie wavelength is the particle is nearer the origin than when its value is
Answer:
The answer is the option (b,d)Question:14
Answer:
It is given that the proton and -particle are accelerated at theQuestion:15
(i) In the explanation of photoeletric effect, we assume one photon of frequency v collides with an electron and transfers its energy. This leads . to the equation for the maximum energy Emax of the emitted electron as
where is the work function of the metal. If an electron absorbs 2 photons (each of frequency v), what will be the maximum energy for the emitted electron?
(ii) Why is this fact (two photon absorption) not taken into consideration in our discussion of the stopping potential?
Answer:
(i) In the question, 2 photons transfer its energy to one electron as E=hvQuestion:16
Answer:
With an increase in the wavelength of the photon, there is a decrease in the frequency or increase in the energy of the photon. Let us consider 2 possible cases:Question:17
Do all the electrons that absorb a photon comes out as photo electrons?
Answer:
A common observation in the photoelectric effect is that most of the electrons knocked by photons are scattered into the metal by absorbing photons. In order to escape from the surface, the electron must absorb enough energy to overcome the positive ion attraction in the material of the surface.Question:19
Answer:
There is a transfer of momentum to the atoms on the metal surface when the photons strike the surface. This also results in a decrease in speed of the photons. Thus, the momentum of photons is transferred to the nucleus and electrons of the metal.Question:22
Answer:
Question:25
Answer:
Area (A)=10-2 cm2=10-4m2Question:26
Answer:
Question:27
(i) Which material A or B has a higher work function?
(ii)Given the electric charge of an electron = 1.6 x 10-19C, find the value of h obtained from the experiment for both A and B. Comment on whether it is consistent with Einstein's theory.
Answer:
We know that where v0=Threshold frequencyQuestion:29
Consider a 20 W bulb emitting light of wavelength 5000 and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 .
(i) Estimate no. of photons emitted by the bulb per second. [Assume no other losses]
(ii) Will there be photoelectric emission?
(iii) How much time would be required by the atomic disk to receive energy equal to work function (2 eV)?
(iv) How many photons would atomic disk receive within time duration calculated in (iii) above?
(v) Can you explain how photoelectric effect was observed instantaneously?
Answer:
Given that P=20WThe students will be able to learn various questions related to different things about the nature of electromagnetic waves and how their nature can help and make the process of different phenomena possible. NCERT Exemplar solutions for Class 12 Physics chapter 11 also deals with various different experimentation used to prove the dual nature of electromagnetic waves which gives the learners an insight on the emergence of such principles and how they were used further for deriving useful knowledge out of it. Learners will also learn about different developments at different periods of time by different people about the nature of electromagnetic waves and their sequence. NCERT Exemplar Class 12 Physics solutions chapter 11 will also give a lot of knowledge about the wave theory of light, which will enlighten and provide them with a logical explanation for various phenomena happening around them in real life.
Also read NCERT Solution subject wise
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Also Check NCERT Books and NCERT Syllabus here:
These questions are solved keeping in mind the CBSE pattern and how the marks are divided as per the steps.
Yes, one can download these questions so that one uses the solutions offline.
Try to understand the NCERT exemplar solutions for Class 12 Physics chapter 11 and connect them to the topics that one has studied in the chapter.
One will learn in detail about wave theory of light, particle nature of light, photoelectric effect, Davisson and Germer experiment, etc.
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Hello there! Thanks for reaching out to us at Careers360.
Ah, you're looking for CBSE quarterly question papers for mathematics, right? Those can be super helpful for exam prep.
Unfortunately, CBSE doesn't officially release quarterly papers - they mainly put out sample papers and previous years' board exam papers. But don't worry, there are still some good options to help you practice!
Have you checked out the CBSE sample papers on their official website? Those are usually pretty close to the actual exam format. You could also look into previous years' board exam papers - they're great for getting a feel for the types of questions that might come up.
If you're after more practice material, some textbook publishers release their own mock papers which can be useful too.
Let me know if you need any other tips for your math prep. Good luck with your studies!
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hello mahima,
If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
hope this helps.
Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.
Thank you and wishing you all the best for your bright future.
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