1.

Given that solar constant on earth surface is S. If sunlight is assumed to be monochroomatic with wavelength lambda and this wavelength is less than the threshold wavelength for earth surface for electron emission. (The solar constant is defined as the intensity of light falling on the earth. Charge on electron is e and velocity of light is c) If near the earth surface n_(p) is the photon density and n_(e) is the electron density then we have

Answer»

`n_(e) gt n_(p)`
`n_(e)LT n_(p)`
`n_(e)=n_(p)`
`n_(e)` and `n_(p)` cannot be COMPARED

ANSWER :A


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