Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 
The threshold frequency of the material is
Text Solution
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For hydrogen atom, 
For ground state, 
For first excited state, 
The energy of the emitted photon when an electron jumps from first excited state to ground state is
Maximum kinetic energy,
According to Einstein’s photoelectric equation 
where 
is the work function and 
is the incident energy
Threshold frequency 
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