The fundamental source of e.m. waves

a. If the fundamental source wave is a vibrating object, what is the fundamental source of an electromagnetic wave ? b. Give the expression for velocity of E.M waves in vacuum. c. On what factors does its velocity in vaccum depend ?

Which is most fundamental property of a wave?

State essential properties of e.m. waves.

In a half wave rectifier the AC input source of frequency 50 Hz is used. The fundamental frequency of the output is

In a half wave rectifier, the AC input source of frequency 50 Hz is used. The fundamental frequency of the output is

The fundamental characteristic of all waves are

Name the fundamental particle of an atom that has highest value for its e/m