Practice Quiz

Praxis II General Science

Category - Physics

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Light moves very quickly, at the speed of 3 x 108 m/s. The range of visible light that we can see is around 600 nm. At this range, what is the frequency of the light?
  1. 2.5 x 108 Hz
  2. 3.0 x 1012 Hz
  3. 5.0 x 1014 Hz
  4. 5.8 x 1016 Hz
  5. 7.1 x 1018 Hz
Explanation
Answer: C - The frequency of light is around 5 x 1014 hertz. This can be calculated by using the simple wave equation: λ = (v/f). This is rearranged to give f = v/λ, where f is frequency, v is velocity, and lambda is wavelength. Thus, f = (3 x 108)/(6 x 10-7m), or answer C.
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