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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 11 - Photoelectric Effect > A photon of energy E ejects a photoelectron from a metal surface whose work function is ϕ0. 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)

A photon of energy E ejects a photoelectron from a metal surface whose work function is ϕ0. 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)

If the distance of 100 Watt lamp is increased from a photocell the saturation current i in the photo cell varies with distance d as.