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Exam Questions Papers - Engineering

Q1:

Consider following statements :
  1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
  2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

A statement (1) is true and (2) is false

B statement (1) and (2) both are true

C statement (1) is false and (2) is true

D statement (1) and (2) both are false

ANS:A - statement (1) is true and (2) is false

Statement 2 is false because maximum energy of photons varies linearly with frequency of incident light. It can be shown as follows Photocurrent Vs Anode voltage with frequency and incident light as parameter the light intensity is constant.