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Question

A metal surface has a threshold frequency of 4.0 ×

10¹⁴ Hz. When light of frequency 9.0 × 10¹⁴ Hz is incident on it, what is the stopping potential required to halt the fastest photoelectrons? (Take h = 6.63 × 10⁻³⁴ Js, e = 1.6 × 10⁻¹⁹ C)

A 1.25 V

B 2.07 V

C 3.56 V

D 4.08 V

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