In a photocell bichromatic light of wavelength 2475 Å and 6000 Å are incident on cathode whose work function is 4.8 eV. If a uniform magnetic field of 3 × × 10 –5 Tesla exists parallel to the plate, the radius of the path describe by the photoelectron will be (mass of electron = 9 × × 10 –31 kg)
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Energy of photons corresponding to light of wave length
and that corresponding to 
is
As 
and 
Photoelectric emission is possible with 
only. Maximum kinetic energy of emitted photoelectrons 
.
Photoelectrons experiences magnetic force and move along a circular path of radius
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