Question

Match the LIST-I with LIST-II:

List-I		List-II
A.	Radio-wave	I.	is produced by Magnetron valve
B.	Micro-wave	II.	due to change in the vibrational modes of atoms
C.	Infrared-wave	III.	due to inner shell electrons moving from higher energy level to lower energy level
D.	X-ray	IV.	due to rapid acceleration of electrons

Choose the correct answer from the options given below:

• A. A-IV, B-II, C-I, D-III
• B. A-IV, B-III, C-I, D-II
• C. A-IV, B-I, C-II, D-III
• D. A-II, B-IV, C-III, D-I

Hint:

Always remember radiation types by their origin: antennas (radio), magnetron (microwave), vibration (infrared), inner electrons (X-rays).

Answer 1

The Correct Option is A

To match the items in List-I with those in List-II, we need to understand the characteristics and sources of the different types of electromagnetic waves mentioned: 

1. Radio-wave: Typically produced by rapid acceleration of electrons in antennas, these waves are generally associated with communication technology. Hence, they match with option IV: "due to rapid acceleration of electrons."
2. Micro-wave: These waves are generated using devices like Magnetron valves, which are specially designed to produce microwaves. Thus, they correspond to option I: "is produced by Magnetron valve."
3. Infrared-wave: These waves are commonly produced due to changes in the vibrational modes of atoms and molecules, particularly as they heat up. Therefore, they align with option II: "due to change in the vibrational modes of atoms."
4. X-ray: X-rays are generated when inner shell electrons transition from higher to lower energy levels, releasing energy as X-rays. This describes option III: "due to inner shell electrons moving from higher energy level to lower energy level."

Based on this understanding, the correct matching for the given lists is:

List-I		List-II
A.	Radio-wave	IV.	due to rapid acceleration of electrons
B.	Micro-wave	I.	is produced by Magnetron valve
C.	Infrared-wave	II.	due to change in the vibrational modes of atoms
D.	X-ray	III.	due to inner shell electrons moving from higher energy level to lower energy level

Thus, the correct option is: A-IV, B-I, C-II, D-III