# Question 5563e

##### 1 Answer
Mar 26, 2014

The frequency is 4.4 × 10¹⁴ s⁻¹.

The wavelength λ is the distance between successive peaks in a wave.

The frequency $f$ of a wave is the number of complete waves that pass a point in a given time.

The formula relating the frequency $f$ and wavelength λ is

fλ = c or f = c/λ

where $c$ is the speed of light.

In your case, λ = 680 nm = 680 × 10⁻⁹ m and $c$ = 3.00 × 10⁸ m•s⁻¹.

f = c/λ = (3.00 × 10⁸ m•s⁻¹)/(680 × 10⁻⁹ m)# = 4.4 × 10¹⁴ s⁻¹