Directions for Question: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following four responses:
Assertion: The kinetic energy of the emitted photo-electrons changes only with a change in the frequency of the incident radiations. Reason: The kinetic energy of photo-electrons emitted by a photo-sensitive surface depends upon the intensity of the incident radiation. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.A) If both A and R are true, and R is a correct explanation of the A.
B) If both A and R are true, but R is not a correct explanation of the A.
C) If A is true, but R is false.
D) If both A and R are false.
Correct Answer: C
Solution :
Einsteins photoelectric equation states that \[h\upsilon =h{{\upsilon }_{0}}+K{{E}_{\max }}\] \[\Rightarrow \] \[K{{E}_{\max }}=h\upsilon -h{{\upsilon }_{0}}=h\upsilon -W\] Where \[W=h{{\upsilon }_{0}}=\] work function of the material Therefore we see that the maximum kinetic energy of the emitted photoelectrons depends directly on the frequency of the incident radiations. It does not depend upon the intensity of the light used.
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