A metal surface is illuminated |MODERN PHYSIC| JEE-MAIN 2022

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JEE MAIN 2022

26-06-22 S2

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 90º with the magnetic field. If it starts revolving in a circular path of radius 2 mm, the work function of the metal is approximately :

Select the correct option:

A

1.36 eV

B

1.69 eV

C

2.78 eV

D

2.23 eV

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