What is the frequency range of radio waves? How are radio waves produced?

What is the range of audible sound waves?

What are e.m. waves?How are they produced?

A charged particle oscillates about its mean equilibrium position with a frequency of 10^9 Hz . What is the frequency of the electromagnetic waves produced by the oscillator?

A charged particle oscillates about its mean equilibrium positions with a frequency of 10^8 Hz . What is the frequency of the electromagnetic waves produced by the oscillator?

What is an oscillator ? Draw a labelled circuit diagram for an oscillator using PNP transistor.What is the function of feed back coil in it ? Write an expression for the frequency of waves produced by it.What is the use of waves produced by it ?