Blue light has a wavelength of 455 nm. What would be the frequency?

f= 6.59x10^14

Explanation:

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Blue light is a wave, just like all the other colors of light.  That's lucky for us.  We can use the simple equation that ties together the speed, wavelength, and frequency of a wave. And since we're talking about light here, we know its speed !  It's the speed of light !

Wave speed = (wavelength) x (frequency)

Frequency = (wave speed) / (wavelength)

Frequency = (3 x 10⁸ m/s) / (455 x 10⁻⁹ m)

Frequency = 6.59 x 10¹⁴ Hz.

(That's 659,000 GigaHertz.  My shortwave radio doesn't cover it.)

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