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Light of wavelength 2000 Å falls on an a...

Light of wavelength `2000 Å` falls on an aluminium surface . In aluminium `4.2 e V` of energy is required to remove an electron from its surface. What is the kinetic energy , in electron volt of (a) the fastest and (b) the slowest emitted photo-electron . ( c) What is the stopping potential ? (d) What is the cut - off wavelength for aluminum? (Plank's constant `h = 6.6 xx 10^(-34) J-s` and speed of light `c = 3 xx 10^(8) m s^(-1).

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