Question

What is the wavelength for radio waves with frequency `3 times 10^9`?

Answer 1

`lambda = 0.1m`

Explanation:

The equation for light waves is

`c = flambda`

where `c` is the speed of light, which is always `3xx10^8ms^-1` in a vacuum, `f` is the frequency and `lambda` is the wavelength.

We want to find the wavelength, so rearrange and put in values we know,

`lambda = c/f = (3xx10^8)/(3xx10^9) = (cancel(3)xx10^8)/(cancel(3)xx10^9) = 10^-1 = 0.1m`