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Dual Nature of Radiation and Matter

  1. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 Å. Its work function is
    1. 4 × 10–19 J
    2. 1 J
    3. 2 × 10–19 J
    4. 3 × 10–19 J
Correct Option: A

W0 =
hc
λ0

=
6.63 × 10-34 × 3 × 108
= 4 × 10-19 J
5000 × 10-10



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