Question

What is the frequency of green light, which has a wavelength of 4.9X10^-7m?

Answer 1

The relationship between the wavelength λ and the frequency ν is the following:

$λ = \frac{c}{ ν}$

$ν = \frac{c}{λ}$

c is the speed of light 2.9979 ×10⁸ m/s.

$ν = \frac{2.9979 \times 10^8\;m/s}{4.9 \times 10^{-7}\;m} = 6.11 \times 10^{14}\;1/s = 6.11 \times 10^{14}\;Hz$

Answer: 6.11×10¹⁴ Hz