# What is the frequency in hertz of blue light having a wavelength of 425 nm?

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#### Explanation

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#### Explanation:

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16
Mar 2, 2018

$7 , 0588 \times {10}^{14} H z$

#### Explanation:

Using the equation for the speed of a light wave, and knowing its speed in air, we get :

$c = f \lambda$

$\therefore f = \frac{c}{\lambda} = \frac{3 \times {10}^{8} m / s}{425 \times {10}^{- 9} m} = 7 , 0588 \times {10}^{14} H z$

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