JEE Main 2022 Physics question
A metal surface is illuminated by a radiation of wavelength 4500 Å. 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:
Answer: (1)
Solution
The photon energy is eV. The electron moves in a circle of radius r = mv/(eB),
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