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  • The value of the retarding potential needed to stop the photo-electrons ejected from a metal surface of work function <img alt="\mathrm{1.2 \mathrm{eV} }" src="https://entrancecorner.oncodec

The value of the retarding potential needed to stop the photo-electrons ejected from a metal surface of work function
\mathrm{1.2 \mathrm{eV} } with light of frequency \mathrm{ 5.5 \times 10^{14} \mathrm{~Hz}. }

Option: 1

1.07 \mathrm{~V}


Option: 2

2.04 \mathrm{~V}


Option: 3

4 \mathrm{~V}


Option: 4

6 \mathrm{~V}


Answers (1)

best_answer

\mathrm{I V_0} is the stopping potential, then by einstein photoelectric equation -
\begin{aligned} & e v_0=h f-\omega_0 \\ & v_0=\frac{h f-\omega_0}{e}=\frac{6.62 \times 10^{-34} \times 5.5 \times 10^{14}}{-1.2 \times 1.6 \times 10^{-14}} \\ & v_0=1.07 \mathrm{~V} \text { Ans } \end{aligned}

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vinayak

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