The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a...

WAEC 2013

The work function of a metal is 2.56 x 10^-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10^-19J, h = 6.6 x 10^-34Js]

A. 5.56 x 10¹⁹Hz
B. 1.66 x 10¹⁹Hz
C. 1.12 x 10¹⁵Hz
D. 8.42 x 10¹⁴Hz

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Correct Answer: Option C

Explanation

F = \(\frac{K.E + Wo}{h}\)

= \(\frac{3.0 \times 1.6 \times 10^{-19} + 2.56 \times 106{-19}}{6.6 \times 106{-34}}\)

- 1.12 x 10^-15HZ

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The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a...

Correct Answer: Option C

Explanation

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