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# A beam of light has a wavelength of 506 nanometers. What is the frequency of the light? What color is the light?

Feb 18, 2016

I found: $5.9 \times {10}^{14} H z$, Cyan.

#### Explanation:

You can find the frequency $\nu$ from:
$c = \lambda \cdot \nu$
where:
$\lambda = 506 \times {10}^{-} 9 m$ is the wavelength;
$c = 3 \times {10}^{8} \frac{m}{s}$ is the speed of light in vacuum.
So:
$\nu = \frac{c}{\lambda} = \frac{3 \times {10}^{8}}{506 \times {10}^{-} 9} = 5.9 \times {10}^{14} H z$

It should be Cyan ($506 n m$):