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The radiation corresponding to 3 rarr 2...

The radiation corresponding to ` 3 rarr 2` transition of hydrogen atom falls on a metal surface to produce photoelectrons . These electrons are made to enter circuit a magnetic field `3 xx 10^(-4) T` if the ratio of the largest circular path follow by these electron is `10.0 mm , the work function of the metal is close to

A

1.8 eV

B

1.1 eV

C

0.8 eV

D

1.6 eV

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The correct Answer is:
B
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An electron performs uniform circular motion in a region of magnetic field of induction 3 xx 10^(-3) Wb//m^(2) . If the radius of the circular path of the electron is 2 cm , then the momentum of the electron will be

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the radiation emitted when an electron jumps from n=4 to n=3 in a lithium atom ( z=3 ) fall on a metal surface to produce photoelectron , when the photoelectron with maximum Kinetic energy are made to move perpendicular to a magnetic field of 2xx10^(-4)T , it traces a circular path of radius sqrt(9.1/(1.6))cm , [RhC=13.6eV] (mass of electron= 9.1xx10^(-31)kg)

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