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

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

Option: 1

2.05 \mathrm{~V}


Option: 2

3.04 \mathrm{~V}


Option: 3

1.07 \mathrm{~V}


Option: 4

4.05 \mathrm{~V}


Answers (1)

best_answer

If V_0 is the stopping potential, then by Einstein photoelectric equation, we have
\begin{aligned} e V_0 & =h f-\omega_0 \\ V_0 & =\frac{h f-\omega_0}{e} \\ & =6.62 \times 10^{-34} \times 5.5 \times 10^{14}-1.2 \times 1.6 \times 10^{-19} \\ & =1.07 \mathrm{~V} \quad \text { Ans. } \end{aligned}

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Sanket Gandhi

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