THE BRIGHTNESS OR INTENSITY OF SPECTRAL LINES DEPENDS UPON THE NUMBER OF PHOTONS OF SAME WAVELENTH OR FREQUENCY ABSORBED OR EMITTED
EXPLAIN THIS LINE

Dear ‚ÄčUpanshu Srivastava,

In photoelectric effect, the electrons are emitted from metal surface when light of certain frequency incident on it. The emission of e will takes place only when the frequency of incident is equal or greater than the minimum energy required for the emission of e(threshold frequency). 
When frequency of incident light is greater than the threshold frequency; the excess of freqency is taken up by emitted e and converted to the kinetic energy of e. It means when frequency or energy of light increases kinetic energy of emitted e will increases.
While when brightness or intensity of incident light increases then surface area exposed to (constant frequency of light) light increases hence no. of emitted e will increase but K.E. will remain constant.

Regards

 

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