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  • Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be <img alt="

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 \mathrm{V}. The threshold frequency of the materials is
 

Option: 1

4 \times 10^{15} \mathrm{~Hz}


Option: 2

5 \times 10^{15} \mathrm{~Hz} 


Option: 3

1.6 \times 10^{15} \mathrm{~Hz}


Option: 4

2.5 \times 10^{15} \mathrm{~Hz}


Answers (1)

best_answer

\begin{aligned} & \mathrm{n} \rightarrow 2-1 \\ & \mathrm{E}=10.2 \mathrm{eV} \\ & \mathrm{kE}=\mathrm{E}-\phi \\ & \mathrm{Q}=10.20-3.57 \\ & \mathrm{~h} \mathrm{\nu}_0=6.63 \mathrm{eV} \\ & \mathrm{\nu}_0=\frac{6.63 \times 1.6 \times 10^{-19}}{6.67 \times 10^{-34}}=1.6 \times 10^{15} \mathrm{~Hz} \end{aligned}

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manish painkra

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