JEE Main 2022 · 29 Jun · Shift 1 · Physics Q37

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PhysicsSingle correct+4 / -1Question 37 of 90

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal.

Reason R : Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.

In the light of the above statements, choose the most appropriate answer from the options given below.

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Answer and worked solution

Official answer: B

Both true. Below the work function no electron escapes (A); at exactly the work function the electron has zero kinetic energy (R). R does not explain A.

(B)

Topics:Photoelectric effect

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JEE Main 2022 · 29 Jun · Shift 1, Physics question 37