Question

Match List I (Wavelength range of electromagnetic spectrum) with List II. (Method of production of these waves) and select the correct option from the options given below the lists.

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

A. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

Answer 1

The range of wavelengths between $700nm{\text{ }}to{\text{ }}1mm$ , is referred to as Infrared rays.
The range of wavelengths between $1nm{\text{ }}to{\text{ }}400{\text{ }}nm$, is referred to as ultraviolet rays.
The range of wavelengths $< {10^{ - 3}}$ are known as the Gamma rays.
The range of wavelength $1mm{\text{ }}to{\text{ }}0.1{\text{ }}m$, is referred to as microwaves.

Complete step by step solution:
We know, the range of wavelengths between $700nm{\text{ }} to {\text{ }}1mm$, is referred to as Infrared rays. These are produced by heating an object to such an extent that the molecules start vibrating and it radiates infrared waves. When the object is not hot enough such that it can emit visible light, therefore, it radiates Infrared waves.
Thus, option (a) in list I matches with Option (i) in list II.
The range of wavelengths between $1nm{\text{ }} to {\text{ }}400{\text{ }}nm$, is referred to as ultraviolet rays.Ultraviolet rays are produced due to atomic excitation in a gaseous discharge tube. This atomic excitation occurs when an atom from one energy level jumps to a lower energy level.
Thus, option (b) in list I matches with Option (ii) in list II.
The range of wavelengths $< {10^{ - 3}}$ are known as the Gamma rays. Some of the radioactive substances, when decay releases a spectrum, which falls in the range of $< {10^{ - 3}}$, they emit electromagnetic waves called the gamma rays.
Thus, we can say, Thus, option (c) in list I matches with Option (iii) in list II.
We know again, the range of wavelength $1mm{\text{ }} to {\text{ }}0.1{\text{ }}m$, is referred to as microwaves, and they are produced inside an oven in a tube like structure, called the magnetron.
Thus, we can say, option (d) in list I matches with Option (iv) in list II.

Therefore, Option (D) is showing the correct matching.

Note: These electromagnetic rays are not visible to the human eye but are used in many applications, like transfer of energy, transfer of long and short waves and many more. They also find their applications in the medical industries.