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The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is...

Physics
JAMB 1986

The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 108ms-1, then the frequency of the ultraviolet radiation is

  • A. 1.3 x 1015Hz
  • B. 7.5 x 105Hz
  • C. 1.2 x 1011Hz
  • D. 7.5 x 1014Hz
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Correct Answer: Option D
Explanation

F = \(\frac{V}{\lambda}\)

= \(\frac{3 \times 10^8}{400 \times 10^{-9}}\)

= 75 x 1015Hz

= 7.5 x 10^14 Hz


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