Question

The variation of the stopping potential (V₀) with the frequency (v) 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 metal ______.

Options

• A

• B

• C

• D

Answer 1

The variation of the stopping potential (V₀) with the frequency (v) 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 metal A.

Explanation:

Since the threshold frequency is lower for metal A. Consequently, with an identical frequency of incoming radiation-generating photoelectrons in the metals, the kinetic energy (KE = hv − hv₀) will be maximised for metal A.