What are electromagnetic waves?

Which of the following are not electromagnetic waves?

Electromagnetic waves Electromagnetic waves are those waves in which there are sinusoidal variations of electric and magnetic fields at right angle to each other as well as right angle to the direction of propagation. The ratio of electric vector and magnetic vector gives the velocity of light and vecExxvecB gives the direction of propagation of electromagnetic wave. Which of the following rays are not electromagnetic waves?

What is meant by the transverse nature of electromagnetic waves? Draw a diagram showing the propagation of an electromagnetic wave along the X-direction, indicating clearly the directions of the oscillating electric and magnetic fields associated with it.

What part of electromagnetic waves has the highest frequency?

What is the difference between matter waves and electromagnetic waves?