Q.8. Name the electromagnetic waves, which are produced by.
a. Vibrations of atoms and molecules.
b. Rapid acceleration of electrons in conducting wires.
c. Stopping fast moving electrons by metal targets.
d. Radioactive decay of nucleus.

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Solution

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$a . t h e v i b r a t i o n p r o d u c e d t h e i n f r a r e d w a v e s b . r a p i d a c c n c r e a t e s t h e r a d i o w a v e s . c . t h i s i s t h e c o n c e p t o f p r o d u c t i o n o f t h e x r a y s . d . t h e r a d i o a c t i v e d e a c y r e l e a s e t h e g a m m a r a y a f t e r e x c i t a t i o n$

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The electromagnetic waves produced when fast moving electrons are suddenly stopped by metal target of high atomic number are

	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.

List I

List II .

$List I$	$List II$
$a .$ Source of microwave frequency $b .$ Source of infrared frequency $c .$ Source of Gamma Rays $d .$ Source of X-rays	$i .$ Radioactive decay of nucleus $i i .$ Magnetron $i i i .$ Inner shell electrons $i v .$ Vibration of atoms and molecules $v .$ LASER $v i .$ RC circuit

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