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A photon of energy E ejects a photoelect...

A photon of energy E ejects a photoelectron from a metel surface whose work function is `phi_(0)`. If this electron enters into a unifrom magnetic field of induction B in a direction perpendicular to the field and describes a circular path of radius r, then the radius r, is given by, (in the usual notation)

A

`sqrt((2m(E-W_0))/(eB))`

B

`sqrt((2m(E-W_0)eB))`

C

`sqrt(2e(E-W_0))/(mB)`

D

`sqrt((2m(E-W_0))/(eB))`

Text Solution

Verified by Experts

The correct Answer is:
D
`K_("max") = E-W_0`
Radius (r) = `(mv)/(eB) = (sqrt(2mK))/(eB)=(sqrt(2m(E-W_0)))/(eB)`
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