A photon of energy E ejects a photoelect...

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

`(sqrt(2m(E-W_(0))))/(eB)`

`sqrt(2m(E-W_(0))eB)`

`(sqrt(2e(E-W_(0))))/(mB)`

`(sqrt(2m(E-W_(0))))/(eB)`

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