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((2m(E-phi_0))/(eB))`

`sqrt((2m(E-phi_0)eB)`

`sqrt((2e(E-phi_0))/(mB))`

`sqrt(2m(E-phi_0))/(eB)`

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