CBSE Class 12 · 2024 · Modern PhysicsMultiple Choice

The variation of the stopping potential

V_{0}

with the frequency

ν

of the incident radiation for four metals A, B, C and D is shown in the figure. For the same frequency of incident radiation producing photo-electrons in all metals, the kinetic energy of photo-electrons will be maximum for the metal

(A)A✓ Correct
(B)B
(C)C
(D)D

Answer: (A)

Solution

Since

e V_{0} = h ν - ϕ_{0}

, at a fixed frequency the metal with the smallest work function (smallest threshold frequency, i.e. the left-most line A) gives the largest kinetic energy.

(A) A

CBSE Class 12 Board · 2024 · Single correct option

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