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in Atomic Structure by (49.4k points)

When radiation of 6800 A wavelength strikes in metal surface, the electron with zero velocity emitted. Calculate the threshold frequency and work function (Wo) of the metal

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Threshold wavelength of radiation
o) = 6800 × 10-10 m Or 6.8 × 10-7
Threshold frequency of the metal (vo) = c/λo
= (3 × 108)/(6.8 × 10-7)
vo = 441 × 1014 s-1
Now,
work function (Wo) of the metal = hvo
= (6.626 × 10-34 JS)(441 × 1014S-1)
= 2.922 × 10-19 J

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