Name the types of EM radiations which
are used in destroying cancer cells,
cause tanning of the skin and
maintain the earth's warmth.
Write briefly a method of producing any one of these waves.
Name the electromagnetic waves which maintain the earth's warmth.
Name the electromagnetic waves which are used in aircraft navigation.
How are electromagnetic waves produced?
How do you convince yourself that electromagnetic waves carry energy and momentum?
Electromagnetic waves used as a diagnostic tool in medicine are
Is the ratio of frequencies of ultra-violet rays and infra-red rays in glass more than, less than or equal to 1?
Name the waves that are often referred to as 'heat waves'.
Name the physical quantity that has (i) higher value for these waves, as compared to X-rays.
Name the physical quantity that has (ii) lower value for these waves, as compared to X-rays.
Name the physical quantity that has (iii) same value for these waves, as compared to X-rays.
How are infrared rays produced?
Write two important uses of infrared rays.
What modification was made by Maxwell in Ampere's circuital law?
Electromagnetic waves travel in a medium that has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be:
Identify the different types of electromagnetic radiations, which are used:
(i) to kill germs in water purifiers
(ii) for physical therapy