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-19 Q. 52 Threshold frequency, V, is the minimum frequency which a photon must 31 possess to eject an electron from a metal. It is different for different metals. When a photon of frequency 1.0 x 10 15 5-1 was allowed to hit a metal surface, an electron having 1.988 x 10 J of kinetic energy was emitted. Calculate the threshold frequency of this metal. Show that an electron will not be emitted if a photon with a wavelength equal to 600 nm hits the metal surface