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A photon of energy 'E' ejects a photoelectron from a metal surface whose work functions is Wo. If this electron enters into a uniform 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)

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A photon of energy 'E' ejects a photoelectron from a metal surface whose work functions is Wo. If this electron enters into a uniform 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)