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Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m^{2} falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0cm^{2} of the surface is nearly -

Option: 1

9.61 \times 1014 per sec


Option: 2

4.12 \times 10^{13} per sec


Option: 3

1.51 \times 10^{12} per sec


Option: 4

2.13 \times 10^{11} per sec


Answers (1)

best_answer

\begin{aligned} & n_e=n_c\left(n_{p h}\right) \\ & =\frac{1}{100}\left[5 \times 10^{24} \times 1 \times 10^{-4} \times 300 \times 10^{-9}\right] \\ & =15 \times 10^{11}=1.5 \times 10^{12} / \mathrm{sec} \end{aligned}

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Anam Khan

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