A photon of energy E ejects a photo-electrons from a metal surface whose work function is 
. If this electron enters into a uniform magnetic field B in a direction perpendicular to the field and describes a circular path of radius 
then the radius r is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
As electron describes a circular path of radius r in the magnetic field therefore.
……… (i)
By the Einstein equation.
……… ..(ii)
By putting the value of K in eq (i)
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