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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