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Define the term 'intensity of radiation ...

Define the term 'intensity of radiation in photon picture of light.
Ultraviolet light of wavelength `2270Å` from 100W mercury source irradiates a photo cell made of a given metal. If the stopping potential is -1.3V, estimate the work function of the metal. How would the photon cell respond to a high intensity `(~10^(5) W.m^(-2))` red light of wavelength `6300Å` produced by a laser?

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