radio waves

Using an oscillator. However, if it's already ac, then no action required, it just happens anyhow

Msip how can we be of further help

Create a spark.

You're just going to go down the list of homework questions that you are too lazy to answer for yourself? I think we need to get creative with our response.

Radio is completely passé . . . this was demonstrated by the very first video played on M-TV:

Of course spark gap is a sort of oscillator