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Light emitted by hydrogen gas correspond...

Light emitted by hydrogen gas corresponding to transition from `n= 3` to `n=2` incident on a metal plate.The electron emitted from metal plate with maximum kinetic energy enters a magnetic field `5 xx 10^-4T` perpendicularly. If the radius of path of electron is 7 mm then find the work function of metal.

A

0.91 eV

B

0.81 eV

C

1.01 eV

D

0.5 eV

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