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)

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

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

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

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

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