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If the threshold wavelength for a certain metal is 2000 Å, then the work-function of the metal is
(a) 6.21
(b) 6.2eV
(c) 6.2MeV
(d) 6.2keV
(b)
Threshold wavelength (l) = 2000 Å = 2000 × 10-10 m.
Work function
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