Name the electromagnetic radiations (i) having the wavelength range from 1 mm to 700 nm. Give its two important applications (ii) which can be produced by klystron or a magnetron valve. (iii) having the wavelength range from 1 nm to 10-3 nm. Give its two important applications. (iv) which are produced when high energy electrons are bombarded on a metal target. (v) having largest penetrating power?. Arrange them in the increasing order of wavelength.

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Solution

Dear Student,
(i)Infrared waves have the wavelength between 1 mm to 700 nm .
Use of infrared waves are :
(a) In remote control TV ,VCR etc,
(b) In photography in thin mist.
(ii) Klystron valve or magnetron valve are used for production of microwave.
(iii) Wavelength range from 1 nm to 10^-3 nm is infrared wave.
Uses are :
(a) In remote control TV ,VCR etc,
(b) In photography in thin mist.
(iv) The electromagnetic waves produced are X rays.
(v) Gamma rays have largest penetrating power.
Increasing order of wavelength is-
Microwave >infrared>X ray > gamma ray .
Regards

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	List I		List II
(a)	700 nm to 1 mm	(i)	Vibration of atoms and molecules.
(b)	1 nm to 400 nm	(ii)	In atoms moving from one energy level to a lower level.
(c)	$< 10^{- 3} n m$	(iii)	Radioactive decay of the nucleus.
(d)	1 mm to 0.1 m	(iv)	Magnetron valve.

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