a) Gamma rays
c) Beta rays
d) Cosmic rays
The correct option is: c) Beta rays.
Electromagnetic waves are also known as EM waves that are formed when an electric field comes in contact with the magnetic field. These fields are perpendicular to each other. EM waves travel at a speed of 3 × 108 ms-1 in a vacuum. Gamma rays, microwaves, radio waves are examples of EM waves.
Beta Rays are not Electromagnetic Waves
Beta rays also known as beta radiation is obtained through the emission of an electron. Beta rays are not electromagnetic waves because they are charged particles and are capable of getting deflected by the magnetic field. These rays are not pure energy as a photon.
Check the Video below to learn about Electromagnetism