Exam Questions Paper - ECE Questions and Answers

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Consider the following

Maximum energy of electrons liberated photoelectrically is independent of light intensity
Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

(1) is true and (2) is false

(1) and (2) both are true

(1) is false and (2) is true

(1) and (2) both are false

Answer : Option A

Explanation :

Statement (ii) is false because maximum energy of photons varies linearly with frequency of incident light. It can be shown as follows :

F₁ > F₂ > F₃

j = light intensity = constant

Photocurrent V_s Anode voltage with frequency and incident light as a parameter.