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question_answer1) Directions (Q. No. 1 to 7): In the following questions, A statement of Assertion is followed by a statement of Reason (R). Mark the correct choice as. Assertion (A): The energy (E) and momentum (p) of a photon are related as p = E/c Reason (R): The photon behaves like a particle.
question_answer2) Assertion (A): Photoelectric effect demonstrates the particle nature of light. Reason (R): The number of photoelectrons is proportional to the frequency of light.
question_answer3) Assertion (A): Kinetic energy of photoelectrons emitted by a photosensitive surface depends upon the frequency of incident photon. Reason (R): The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.
question_answer4) Assertion (A): Photosensitivity of a material is high if its work function is low. Reason (R): Work function =\[h{{f}_{0}}\], where \[{{f}_{0}}\] is threshold frequency.
question_answer5) Assertion (A): de-Broglie equation is significant for microscopic particles. Reason (R): de-Broglie wavelength is inversely proportional to the mass of a particle when velocity is kept constant.
question_answer6) Assertion (A): de-Broglie wavelength of a gas molecule is inversely proportional to the square root of temperature. Reason (R): The root mean square velocity of gas molecules depends on temperature.
question_answer7) Assertion (A): Resolving power of electron microscope increases as electron is accelerated through higher voltage. Reason (R): de-Broglie wavelength of electron decreases as accelerating voltage of electron increases.
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