# Class 12 Physics Chapter 11 Case Study Question Dual Nature of Radiation and Matter PDF Download

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 were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Dual Nature of Radiation and Matter to know their preparation level.

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

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 of intensity of incident radiations on photoelectrons emitted by a phototube, the number of photoelectrons emitted per unit time is
(a) increases (b) decreases
(c) remains same (d) None of these

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)

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

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

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 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

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) momentum of A1 is less than the momentum of A2.
(d) energy of A1 is more than the energy of A2.

Answer: (a) their momenta are the same.

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