In the photoelectric experiment, if we use a monochromatic light, the I-V curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission `=10^(-3)%`, i.e. number of photoelectrones emitted are `10^(-3)%` of number of photons incident on metal.) A. 2WB. 5WC. 7WD. 10 W

In the photoelectric experiment, if we use a monochromatic light, the

1.	In the photoelectric experiment, if we use a monochromatic light, the I-V curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission `=10^(-3)%`, i.e. number of photoelectrones emitted are `10^(-3)%` of number of photons incident on metal.) A. 2WB. 5WC. 7WD. 10 W
Answer» Correct Answer - C The energy of incident photons is given by `hv=eV_(s)+phi_(0)=2+5=7 eV` (`V_(s)` is stopping potential and `phi_(0)` is work function) Saturation current `=10^(-5) A =(etaP)/(hv)e=(10^(-5)P)/(7xxe) e` (`eta` is photo emission efficiency) `:.P=7 W`

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