Electromagnetic Waves

What is the name given to that part of electromagnetic
spectrum which is used in 'Radar' ?
[Delhi 2004]

Microwaves are used in Radar'. Why ?
[Delhi 2004]

Name the electromagnetic waves that have
frequencies greater than those of ultra violet
light but less than those of gamma rays.
[Delhi 2004C]

Name the scientist who first (i) predicted the
existence of electromagnetic waves
(ii) experimentally demonstrated the existence
of electromagnetic waves. [Delhi 2004C]

Why is shortwave band used for long distance
radio broadcast ? [AI 2004]

Arrange the given electromagnetic radiations
in the descending order of their frequencies :
Infra-red, X-rays, Ultraviolet and Gamma rays.
[Delhi 2002]