Question

What is the frequency of radiation with a wavelength of 3.82 x 10-7 m?

Answer 1

The wavelength of radiation is $λ = 3.82 \times 10^{-7} \;m$

The speed of radiation is $c = 3 \times 10^8 \; m/s$

The frequency v of radiation:

$v = \frac{c}{λ} \\ = \frac{3 \times 10^8}{3.82 \times 10^{-7}} \\ = 7.85 \times 10^{14} \;s^{-1} \\ = 7.85 \times 10^{14} \;Hz$