First slide
Photo Electric Effect
Question

Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 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 1.0 cm2 of the surface is nearly

Difficult
Solution

Intensity of light

I=Wattarea=nhcnumber  of  photon,  n=IAλhcNumber  of  photoelectron  =1100×IAλhc=11001×104×300×1096.6×1034×3×108=1.5×1012persec.

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