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All electrons ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of uniform electric field of 4N/C. The work function of the surface is –

Option: 1

4eV


Option: 2

6.2 eV


Option: 3

2 eV


Option: 4

2.2 eV


Answers (1)

best_answer

\begin{aligned} & \mathrm{V}_{\mathrm{s}}=\mathrm{E} \cdot \mathrm{d} \\ & \mathrm{V}_{\mathrm{s}}=4 \mathrm{Volt} \\ & \mathrm{eV}_{\mathrm{s}}=\frac{12400}{\lambda}-\mathrm{W} \\ & 4 \mathrm{eV}=\frac{12400 \mathrm{eV}}{2000}-\mathrm{W} \\ & 4 \mathrm{eV}=6.2 \mathrm{eV}-\mathrm{W} \\ & {[\mathrm{W}=2.2 \mathrm{eV}]} \end{aligned}

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Kuldeep Maurya

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