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  • The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function <img alt="5.01 \mathrm{eV}" src="/latex-image/?5.01%20%5Cmathrm%7B

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

Option: 1

2.4 \mathrm{V}


Option: 2

-1.2 \mathrm{V}


Option: 3

-2.4 \mathrm{V}


Option: 4

1.2 \mathrm{V}


Answers (1)

best_answer

\begin{aligned} & \mathbb{K}_{\max }=\frac{\mathrm{hc}}{\lambda}-\mathrm{W}=\frac{\mathrm{hc}}{\lambda}-5.01=\frac{12375}{\lambda(\mathrm{in} \AA)}-5.01 \\ & =\frac{12375}{2000}-5.01=6.1875-5.01=1.17775 \approx1.2 \mathrm{V} \end{aligned}

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manish painkra

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