In an experiment tungsten cathode which has a threshold wavelength 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å . The maximum energy of emitted photo-electron will be

Question

In an experiment tungsten cathode which has a threshold wavelength 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å . The maximum energy of emitted photo-electron will be, 1.2 e V, 1.5 e V, 1.6 e V, 1.8 e V

MARKS App · Accepted Answer

K m a x = h c 1 λ - 1 λ 0 K m a x = 6.62 × 10 - 34 × 3 × 10 8 1.6 × 10 - 19 10 10 1800 - 10 10 2300 K m a x = 1.5 e V

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