Question

What is the wavelength of a radio signal broadcast at a frequency of 99.0 MHz?

Answer 1

`3.bar(03)m`

Explanation:

Radio signals are electromagnetic waves and these travel with the speed of light `c=3xx10^8ms^-1`.

The expression connecting speed, wavelength `lambda` and frequency `n` of electromagnetic waves is
`c=nxxlambda`

Inserting given and known numbers
`3xx10^8=99.0xx10^6xxlambda`, solving for wavelength
`lambda=(3xx10^8)/(99.0xx10^6)=3.bar(03)m`