In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Case Study and Passage Based Questions with Answers Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Case Study Questions Dual Nature of Radiation and Matter to know their preparation level.
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In CBSE Class 12 Physics Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Dual Nature of Radiation and Matter Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
Case Study/Passage-Based Questions
Case Study 1: The photoelectric effect is the phenomenon of emission of electrons from a metal surface when radiations of suitable frequency fall on them. The emitted electrons are called photoelectrons and the current so produced is called photoelectric current.
With the increase in intensity of incident radiations on photoelectrons emitted by a phototube, the number of photoelectrons emitted per unit of time is
(a) increases (b) decreases
(c) remains same (d) None of these
Answer: (a) increases
It is observed that photoelectron emission stops at a certain time t after the light source is switched on. The stopping potential (V) can be represented as
(a) 2(KEmax/e) (b) (KEmax/e)
(c) (KEmax/3e) (d) (KEmax/2e)
Answer: (b) (KEmax/e)
A point source of light of power 3.2 × 10–3 W emits monoenergetic photons of energy 5.0 eV and work function 3.0 eV. The efficiency of photoelectron emission is 1 for every 106 incident photons. Assume that photoelectrons are instantaneously swept away after emission. The maximum kinetic energy of photon is
(a) 4 eV (b) 5 eV
(c) 2 eV (d) Zero
Answer:(c) 2 eV
If the frequency of incident light falling on a photosensitive metal is doubled, the kinetic energy of the emitted photoelectron is
(a) unchanged
(b) halved
(c) doubled
(d) more than twice its initial value
Answer:(d) more than twice its initial value
Case Study/Passage-Based Questions
Case Study 2:According to de-Broglie, a moving material particle sometimes acts as a wave and sometimes as a particle or a wave associated with a moving material particle which controls the particle in every respect. The wave associated with the moving particle is called matter-wave or de-Broglie wave where wavelength called de-Broglie wavelength, is given by λ = h/mv.
If a proton and an electron have the same de Broglie wavelength, then
- (a) kinetic energy of electron < kinetic energy of proton
- (b) kinetic energy of electron = kinetic energy of proton
- (c) momentum of electron = momentum of proton
- (d) momentum of electron < momentum of proton
Answer: (c) momentum of electron = momentum of proton
Which of these particles having the same kinetic energy has the largest de Broglie wavelength?
(a) Electron
(b) Alpha particle
(c) Proton
(d) Neutron
Answer: (a) Electron
Two particles A1 and A2 of masses m1, and m2 (m1 > m2) have the same de Broglie wavelength. Then
(a) their momenta are the same.
(b) their energies are the same.
(c) the momentum of A1 is less than the momentum of A2.
(d) the energy of A1 is more than the energy of A2.
Answer: (a) their momenta are the same.
Case Study 3: Chapter 11, Dual Nature of Radiation, introduces the concept that light and other forms of electromagnetic radiation exhibit both wave-like and particle-like properties, a core principle of quantum mechanics. The wave-particle duality is particularly highlighted by the photoelectric effect, which is the emission of electrons or other free carriers when light shines on a material. Albert Einstein, building on the work of Max Planck, proposed that light is made up of packets of energy called ‘quanta’ or ‘photons,’ each carrying a discrete amount of energy proportional to its frequency (E=hf, where h is Planck’s constant). This explanation solved the mystery of the photoelectric effect, which couldn’t be adequately explained by classical wave theory. Similarly, de Broglie hypothesized that particles such as electrons can exhibit wave-like properties, thereby introducing the idea of matter waves.
What does the dual nature of radiation refer to?
A) Radiation can exhibit both wave-like and particle-like properties.
B) Radiation can be either harmful or beneficial.
C) Radiation can be both visible and invisible.
D) Radiation can be both ionizing and non-ionizing.
What is the photoelectric effect?
A) The absorption of electrons when light shines on a material.
B) The emission of electrons or other free carriers when light shines on a material.
C) The reflection of light from a material.
D) The refraction of light as it passes through a material.
Who proposed that light is made up of packets of energy called ‘quanta’ or ‘photons’?
A) Niels Bohr
B) Werner Heisenberg
C) Max Planck
D) Albert Einstein
What does ‘E=hf’ represent in the context of photon energy?
A) E is the energy of the photon, h is Planck’s constant, and f is the frequency of the light.
B) E is the energy of the photon, h is the frequency of the light, and f is Planck’s constant.
C) E is the frequency of the light, h is the energy of the photon, and f is Planck’s constant.
D) E is the frequency of the light, h is Planck’s constant, and f is the energy of the photon.
Who hypothesized that particles such as electrons can exhibit wave-like properties?
A) Max Planck
B) Niels Bohr
C) Louis de Broglie
D) Werner Heisenberg
Answers:
- A) Radiation can exhibit both wave-like and particle-like properties.
- B) The emission of electrons or other free carriers when light shines on a material.
- D) Albert Einstein
- A) E is the energy of the photon, h is Planck’s constant, and f is the frequency of the light.
- C) Louis de Broglie
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