Question

Match List I with List II: 

List I (EM Wave)	List II (Production)
A. Microwave	I. Electronic transitions in atoms
B. Visible light	II. Radioactive decay of nucleus
C. Gamma rays	III. Vibration of atoms and molecules
D. Infra-red rays	IV. Klystron or magnetron valve

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

Hint:

To remember Infrared (IR), associate it with "Heat." Heat is the kinetic energy of vibrating molecules, which directly matches List II-III.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Electromagnetic waves are produced by various physical processes ranging from electronic transitions to nuclear decay.

Step 2: Detailed Explanation:

• A $\rightarrow$ IV: Microwaves are produced by special vacuum tubes like klystrons, magnetrons, or Gunn diodes.
• B $\rightarrow$ I: Visible light is emitted when electrons in atoms drop from higher energy levels to lower ones.
• C $\rightarrow$ II: Gamma rays originate from the transitions within the nucleus during radioactive decay.
• D $\rightarrow$ III: Infra-red rays are often called "heat waves" because they are produced by the thermal vibrations of atoms and molecules.

Step 3: Final Answer:
The correct matching is A-IV, B-I, C-II, D-III.