15. Electromagnetic Spectrum

The splitting up of white light into a spectrum is known as dispersion. White light is a mixture of all the different colours of the spectrum. In a prism, as white light enters, it slows down due to refraction which also means that its speed changes. Dispersion occurs...

All electromagnetic waves travel at the same speed and in a vacuum. They have the same speed as light – (3 × 108 m/s). Like light, the speed of electromagnetic waves depend on the material they travel through, and they travel the fastest in a vacuum. The...