The potential difference that must be applied to stop the fastest photoelectrons

The Potential Difference That Must Be Applied To Stop The Physics QuestionThe Potential Difference That Must Be Applied To Stop The Physics Question

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:

Options

(a) 2.4 V
(b) – 1.2 V
(c) – 2.4 V
(d) 1.2 V

Correct Answer:

1.2 V

Explanation:

Kₘₐₓ = hc / – W = hc / λ – 5.01
= 12375 / λ(in Å) – 5.01
12375 / 2000 – 5.01 = 6.1875 – 5.01 = 1.17775
= 1.2 V

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