Gamma rays have the smallest wavelength and highest frequency while radio waves have the longest wave length and lowest frequency.
Electromagnetic waves have been part of our lives, though we cannot see them. They are very useful in many ways.
From this diagram, we can see that electromagnetic waves are transverse waves. In addition, they are both electric and magnetic fields, oscillating at 90° to each other!!
They can transfer energy from one place to another. For example, electromagnetic waves from the Sun transport thermal and light energy through space to the Earth. To add on, electromagnetic waves are able to travel through vacuum and do not require any medium to travel from one point to another.
These electromagnetic waves obey laws of reflection and refraction. They also do no carry any electrical charge as they are neither positively nor negatively charged.
Apart from that, all their frequencies do not change when they travel from one medium to another. This is because their frequency depend only on their source.
Gamma Rays are used for radiation therapy, or in other words, to treat cancer. These rays are directed at cancerous tumors to kill cancer cells.
X-rays are used for medical purposes too. They can penetrate any material as therefore can also be used in airports for security checks.
Ultraviolet radiation is used in sterilisation of medical equipment and artificial tanning.
Visible light is used everywhere!!!
Infrared is also another ray being used almost everywhere! Our remote controllers, ear thermometers etc. all use electromagnetic waves
Microwaves are used in satellite tv's, penetrating thorough smoke, haze, light rain and clouds. However, these rays must be directed properly, from one satellite dish to another without any obstruction.
Radio waves are not only used radio but also wireless telegraphy, radar, navigation, telephone transmission etc.Unlike microwaves, they are able to go able objects due to their longer wavelength.
