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Question

Physics Question on Photoelectric Effect

The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 A˚.5000\, \mathring{A}. Its work function is

A

4×10−19 J4 \times 10^{-19}\, J

B

1 J1 \, J

C

2×10−19 J2 \times 10^{-19}\, J

D

3×10−19 J3 \times 10^{-19}\, J

Answer

4×10−19 J4 \times 10^{-19}\, J

Explanation

Solution

W0=hc?0=6.63×10−34×3×1085000×10−10=4×10−19 JW_0 = \frac{hc}{?_0}=\frac{6.63 \times 10 ^{-34} \times 3 \times 10^8 }{5000 \times10^{-10}}=4 \times 10^{-19}\, J