Free PDF Download of CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Assertion Reason Questions for Class 12 Physics. Class 12 Physics Assertion Reason 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.
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Dual Nature of Radiation and Matter Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A) : Photoelectric effect demonstrates the wave nature of light.
Reason (R) : The number of photoelectrons is proportional to the frequency of light
(d) A is false and R is also false.
Assertion (A) : The de-Broglie wavelength of particle having kinetic energy K is l. If its kinetic energy becomes 4 K then its new wavelength would be l/2.
Reason (R) : The de-Broglie wavelength l is inversely proportional to square root of the kinetic energy
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : There is a physical significance of matter waves.
Reason (R) : Both interference and diffraction occurs in it.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : A photon has no rest mass, yet it carries definite momentum.
Reason (R) : Momentum of photon is due to its energy and hence its equivalent mass
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : Photosensitivity of a metal is high if its work function is small.
Reason (R) : Work function = hu0, where u0 is the threshold frequency
(b) Both A and R are true but R is not the correct explanation of A.
Assertion : The kinetic energy of photoelectrons emitted from metal surface does not depend on the intensity of incident photon.
Reason : The ejection of electrons from metallic surface is not possible with frequency of incident photons below the threshold frequency.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion : Two photons of equal wavelength must have equal linear momentum.
Reason : Two photons of equal linear momentum will have equal wavelength.
(d) A is false and R is also false.
Assertion : Two sources of equal intensity always emit equal number of photons in any time interval.
Reason : Two sources of equal intensity may emit equal number of photons in any time interval.
(d) A is false and R is also false.
Assertion : The photon behaves like a particle.
Reason : If E and P are the energy and momentum of the photon, then p = E / c .
(a) Both A and R are true and R is the correct explanation of A.
Assertion : In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. It violate the principle of conservation of linear momentum.
Reason : It does not violate the principle of conservation of linear momentum.
(d) A is false and R is also false.
Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.
(d) A is false and R is also false.
Assertion (A): The dual nature of radiation refers to the fact that electromagnetic radiation exhibits both wave-like and particle-like properties.
Reason (R): Electromagnetic radiation, such as light, shows interference and diffraction patterns like waves and can also exhibit the photoelectric effect, demonstrating particle-like behavior.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The wavelength of electromagnetic radiation is directly proportional to its momentum.
Reason (R): According to de Broglie’s hypothesis, the momentum of a particle (including photons) is inversely proportional to its wavelength.
(d) A is false and R is also false.
Assertion (A): The photoelectric effect occurs when photons of light strike a metal surface and emit electrons from it.
Reason (R): The energy of a photon is directly proportional to its frequency, and for photoelectric effect to occur, the energy of photons must exceed the work function of the metal.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Increasing the intensity of light on a metal surface increases the kinetic energy of emitted photoelectrons.
Reason (R): The intensity of light determines the number of photons incident on the surface, but the kinetic energy of photoelectrons depends only on the frequency of light.
Answer: (c) A is true but R is false.
Assertion (A): The maximum kinetic energy of photoelectrons increases with an increase in the frequency of incident light.
Reason (R): The energy of a photon is directly proportional to its frequency, and the excess energy above the work function contributes to the kinetic energy of emitted electrons.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The de Broglie wavelength of a particle is inversely proportional to its momentum.
Reason (R): The de Broglie wavelength of a particle is given by λ = h / p, where h is Planck’s constant and p is the momentum of the particle.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The wave nature of particles is observed in electron diffraction experiments.
Reason (R): In electron diffraction, electrons are diffracted as they pass through a crystal lattice, exhibiting wave-like interference patterns.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The stopping potential in the photoelectric effect is independent of the intensity of incident light.
Reason (R): The stopping potential depends only on the frequency of incident light, which determines the energy of photons.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The Compton effect demonstrates the particle nature of electromagnetic radiation.
Reason (R): In the Compton effect, X-rays (photons) are scattered by electrons, showing a shift in wavelength due to particle-like interactions.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The work function of a metal is the minimum energy required to release an electron from its surface.
Reason (R): For the photoelectric effect to occur, the energy of incident photons must be greater than or equal to the work function of the metal.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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