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The photoelectric work function for a metal surface is 4.125 eV. The cut off wavelength for this surface is
(a) 4125 Å
(b) 3000 Å
(c) 6000 Å
(d) 2062.5 Å
(b)
Let l0 be cut off wavelength
work function. = = 4.125 × 1.6 × 10-19
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