light with a wavelength of 400nm strikes the surface of metallic cesium in photo cell.and maximum kinetic energy of the electron enjected is 1.54×10^-19 J.calculate ghe work function of cesium and the longest wavelengthof light that is cappable of enjecting electrons from that metal ?
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light with a wavelength of 400nm strikes the surface of metallic cesium in photo cell. and maximum kinetic energy of the electron enjected is 1.54×10^-19 J.
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