Select wrong statement from the following Electromagnetic waves:

 Travel with same speed in all media

1. Electromagnetic waves are transverse and do not need a material medium to travel. 
2. The speed of all electromagnetic waves is equal to the speed of light. In fact this let to the conclusion that light is an electromagnetic wave.

3. Accelerating charge particles produce electromagnetic waves.

4. However the speed of electromagnetic waves changes with medium as $V = \frac{c}{\mu}$