Question

Match the list 1 with list 2

Column 1	Column 2
Source of microwave frequency	Radioactive decay of the nucleus
Source of infrared frequency	Magnetron
Source of Gamma Rays	Inner shell electrons
Source of X-rays	The vibration of atoms and molecules

Answer 1

Source of microwave frequency

1. The sources of microwaves are some special types of high-powered vacuum tubes such as Klystron, magnetron, or Gun diodes.
2. The microwaves are radio waves of a very short wavelength between the range$0.3GHz$ and$300GHz$.
3. Thus, (A) Source of microwave frequency - (II) Magnetron

Source of infrared frequency

1. Infrared spectroscopy deals with the study of absorption of infrared waves, which causes the vibration of atoms and molecules.
2. When infrared radiation falls on molecules, they absorb it and transition takes place from the ground vibrational state to an excited vibrational state.
3. Thus, (B) Source of infrared frequency - (IV) Vibration of atoms and molecules

Source of Gamma Rays

1. When radioactive decay occurs from the atomic nuclei of any radioactive substance, electromagnetic radiation arises.
2. Gamma rays are the shortest wavelength rays of electromagnetic radiation.
3. Thus, (C) Source of Gamma Rays - (I) Radioactive decay of the nucleus

Source of X-rays

1. X-rays are packets of electromagnetic energy (photons) produced by electron clouds in atoms.
2. This usually occurs because the electron's energy changes from a high energy level to a low energy level, releasing excess energy.
3. Thus, (D) Source of X-rays - (III) Inner shell electrons

Hence,

(A) Source of microwave frequency	(II) Magnetron
(B) Source of infrared frequency	(IV) Vibration of atoms and molecules
(C) Source of Gamma Rays	(I) Radioactive decay of the nucleus
(D) Source of X-rays	(III) Inner shell electrons