Calculate the work function in electron volt for a metal, given that the photoelectric
threshold wavelength is 6800Å.
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Explanation:
wavelength = 6800 x 10^-10 m
threshold frequency = C/ lambda
= 3 x 10⁸/(6800 x 10^-10)
= ( 3 x 10¹⁸) /6800
work function = h x frequency
= 6.634 x 10^-34 x (3 x 10¹⁸)/6800 J
= (6.634 x 3 x 10^-16)/ 6800 x 6.625 x 10¹⁸ eV
= ( 6.634 x 6.625 x 3 )/68 eV
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