Write the expression for speed of electromagnetic waves in free space.
The speed of electromagnetic waves in free space is given by,
where, μ0 = absolute permeability and, ε0 is the absolute permeability of the free space.
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Name the electromagnetic radiation to which the following wavelengths belong: (a) 10-2 m (b) 1 Å
(a) Range of microwaves vary from 0.3 to 10-3 m (b) Range of X-rays vary from 3 × 10-8 to 1 × 10-13 m
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Name the part of electromagnetic spectrum which is suitable for (i) radar systems used in aircraft navigation. (ii) treatment of cancer tumours.
(i) Microwave (ii) Gamma rays
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What is the name given to that part of electromagnetic spectrum which is used for taking photographs of earth under foggy conditions from the great height?
Infrared rays.
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Special devices like the klystron value or the magnetron valve, are used for production of electromagnetic waves. Name these waves and also write one of their applications.
Klystron valve or magnetron valve are used for production of microwave. Application: Microwaves are used in microwave Ovens.
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