In the photoelectric experiment, if we use a monochromatic light, the \( I-V \) curve is as show...

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In the photoelectric experiment, if we use a monochromatic light, the \( I-V \) curve is as shown. If work function of the metal is \( 2 \mathrm{eV} \), estimate the power (in W) of light used. (Assume efficiency of photo emission \( \left(10^{-3}\right) \% \), i.e. number of photoelectrons emitted are \( \left(10^{-3}\right) \% \) of number of photons incident on metal.)
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