Case: Read the passage and answer the following questions

The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet rays, X- rays and gamma rays.

The classification is roughly based on?

Wavelength and frequency of waves

The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency.