A green laser pointer emits light with a wavelength of 542 nm. What is the frequency of this light?

Question

03-04-2018
Chemistry

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A green laser pointer emits light with a wavelength of 542 nm. What is the frequency of this light?

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transitionstate transitionstate · Answer 1 · 2018-04-12T15:23:10+02:00

As we know that wavelength and frequency is inversely proportional to each other. Greater the wavelength smaller the frequency and vice versa.

Solution:

The relation between wavelength and frequency is as follow,

υ = c / λ

where
  υ = frequency = ?
c = velocity of light = 3.0 × 10⁸ ms⁻¹
  λ = wavenumber = 542 nm = 542 × 10⁻⁹ m
Putting the given values,

  υ = 3.0 × 10⁸ ms⁻¹ / 542 × 10⁻⁹ m
Result:
  υ = 5.53 × 10¹⁴ s⁻¹