12th Class Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank

done Assertion And Reason (MCQs) - Dual Nature of Radiation and Matter Total Questions - 7

• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• 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.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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