# Frequency of Electromagnetic Radiations/Waves?

"A charge that is accelerated will produce variable electric and magnetic fields. These are electromagnetic waves. If the charge oscillates with a frequency f, then the resulting EM wave will have a frequency f. If the charge ceases to oscillate, then the EM wave is a pulse."

That is what i read but in some cases charges do not oscillate, they just accelerate but yet its said that they produce the electromagnetic waves of some frequency ?

Is the concept of frequency also applied to non oscillating waves ? What would be the cycle of those waves which are just variable but not oscillating ?

• Consider a pulse, made up of various frequencies. – Peter Diehr May 6 '16 at 21:04
• Related question: How and why does accelerating charges radiate electromagnetic radiation?, additionally, see Feynman's Lectures for a corresponding derivation. To address the second part: the concept of frequency can be applied to any function as every function can be described by a combination of them, see Fourier Transform. – Guillermo Angeris May 6 '16 at 22:52
• so every function has a frequency ? what if a function is the combination of different frequencies ? what would be the frequency of that function then ? – Alex May 7 '16 at 7:01
• so by doing a fourier analysis we can find the fundamental frequency of any wave and that fundamental frequency will be ragarded as the frequency of that wave/function ? am i right ? – Alex May 7 '16 at 8:14