Question

Visible light travels at a speed 3.0 × 108 of m/s. If red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light? 2.2 × 10–15 HZ 2.0 × 102 HZ 3.0 × 108 HZ 4.6 × 1014 HZ

Answer 1

Answer:

$4.6\cdot 10^{14} Hz$

Explanation:

The frequency of an electromagnetic wave is given by:

$f=\frac{c}{\lambda}$

where

$c=3.0\cdot 10^8 m/s$ is the speed of light

$\lambda$ is the wavelength

Red light has a wavelength of

$\lambda=6.5\cdot 10^{-7} m$

So by using the formula above we can calculate its frequency:

$f=\frac{3.0\cdot 10^8 m/s}{6.5\cdot 10^{-7} m}=4.6\cdot 10^{14} Hz$