plz answer this question :- How does a charge q oscillating at certain frequency produce electromagnetic waves ?

The requirements of an electromagnetic wave are:

1. An oscillating electric field

2. An oscillating magnetic field

An electric field is accompanied by a charged particle. If we move the charge particle with constant velocity, we have a constant current which produces a magnetic field. Now if we accelerate the charged particle, suppose we start oscillating it, we have an oscillating electric field and also an oscillating magnetic field. If its frequency of oscillation is f, then it produces an electromagnetic wave with frequency f. The wavelength λ of this wave is given by λ = c/f.