Q .     When `0.50 A` X-rays strike a material, the photoelectrons from the k-shell are observed to move in a circle of radius `23` mm in a magnetic field of `2 xx 10^(-2)` tesla acting perpendicularly to the direction of emission of photoelectrons. What is the binding energy of k-shell electrons?

BITSAT 2015
A

`3.5 KeV`

B

`6.2 KeV`

C

`2.9 KeV`

D

`5.5 KeV`

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