what are the applications of various electromagnetic waves ???

Electromagnetic waves classified according to their frequency range:

Radio waves:

 Radio waves are used in ground wave propagation, sky wave propagation, television waves, commercial FM radio and used in cellular phones communication.

 

Microwave:

Microwaves used in radar system, for cooking purposes. Microwaves are useful in communication because they can penetrate clouds, smoke, and light rain.

 

Infrared waves:

Infrared waves are used in solar water heater, solar cooker, weather forecasting through infrared photography, for producing dehydrated fruits. It also used in green house effect to keep the plants warm.

Visible light:

Visible light emitted or reflected by everything which provides us information about the surrounding word.

Ultraviolet rays:

Ultraviolet rays are used to destroy bacteria and for sterilizing the surgical instruments, burglar alarm. These rays are also used to detect forged documents, finger print in forensic laboratory, preserve food stuff.

X-rays:

They can penetrate soft tissue like skin and muscle and are used to take X-ray pictures of bones in medicine. 

γ-rays:

Theses rays used in treatment of cancer and tumors, taking detailed images for diagnostic medicine. Gamma rays are produced in high energy nuclear explosions and supernovas.