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A small plate of a metal (work function ...

A small plate of a metal (work function `=1.7eV`) is placed at a distance of 2m from a monochromatic light source of wavelength `4.8xx10^(-7)m` and power `1.0`watt` `. The light falls normally on the plate. Find the number of photons striking the metal plate per square meter per second. If a constant magnetic field of strength `10^(-4)T` is applied parallel to the metal surface, find the radius of the largest circular path followed by the emitted photoelectrons. (use `h=6.63xx10^(-34)Js` , mass of electron=`9.1xx10^(-31)kg`, charge of electron=`1.6xx10^(-19)C`

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