Question

Match List - I with List - II:

	List - I (Electromagnetic Waves)		List - II (Wavelength)
(a)	AM radio waves	(i)	10-10 m
(b)	Microwaves	(ii)	102 m
(c)	Infrared Radiations	(iii)	10-2 m
(d)	X - rays	(iv)	10-4 m

Choose the correct answer from the options given below:

• (a) - (iv), (b) - (iii), (c)-(ii), (d) - (i)
• (a) - (iii), (b) - (ii), (c)-(i), (d) - (iv)
• (a) - (iii), (b) - (iv), (c)-(ii), (d) - (i)
• (a) - (ii), (b) - (iii), (c)-(iv), (d) - (i)

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Electromagnetic waves are classified according to their wavelength (\(\lambda\)) or frequency (\(f\)) in the electromagnetic spectrum.
From high frequency to low frequency (or short wavelength to long wavelength), the order is: Gamma rays, X-rays, UV, Visible, Infrared, Microwaves, and Radio waves.
Step 2: Detailed Explanation:
We match each wave type to its characteristic order of magnitude wavelength:
1. AM Radio Waves: These have the longest wavelengths in the list, typically in the range of hundreds of meters. Matches (ii) \(10^2\) m.
2. Microwaves: These are commonly used in radar and ovens, with wavelengths in the centimeter range. Matches (iii) \(10^{-2}\) m.
3. Infrared radiations: These are "heat waves" just below visible red light, with wavelengths smaller than microwaves. Matches (iv) \(10^{-4}\) m.
4. X-rays: These are high-energy waves with very short wavelengths, comparable to atomic dimensions. Matches (i) \(10^{-10}\) m.
Comparing with options, the correct sequence is (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i).
Step 3: Final Answer:
The correct matching is provided in option (D).