A Photo sensitive material would emit el...

A Photo sensitive material would emit electrons if excited by photons beyond a threshold. To overcome the threshold, one would increases -

Voltage applied to the light source

Intensity of light

Wavelength of light

The frequency of light

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By theory
for photon electric effect
`vgtv_(0)`

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The ground state energy of an atom is -13.6eV . The photon emitted during the transition of electron from n=3 to n=1 state, is incidenet on a photosensitive material of unknown work function. The photoelectrons are emitted from the materials with a maximum kinetic energy of 9 eV. the threshold wavelength of the material used is

Radiations of frequencies 8xx10^(15) Hz and 5xx10^(15) Hz are incident one after the another on the same photosensitive surface. If is found that the kinetic energies of the photo electrons emitted from the surface are in the ratio of 2:1 . What is the threshold frequency for the surface ?

Assertion: Light of frequency 1.5 times the threshold frequency is incident on photo-senstive material. If the frequency is halved and intensity is doubled, the photo current remains unchanged. Reason: The photo electric current varies directely with the intensity of light and frequncy of light.

Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon. Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

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