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CGP EDU Academic Team
Published on: September 12, 2026
A metal surface is illuminated by a radiation of wavelength 4500 
. The ejected photo-electron enters a constant magnetic field of 2 mT making an angle of 90° with the magnetic field. If it starts revolving in a circular path of radius 2 mm, the work function of the metal is approximately:
Text Solution
Verified by ExpertsThe correct answer is:
A
X = 4500 
B = 2mT, R = 2mm
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