Question

Match List-I with List-II
\[\begin{array}{|l|l|} \hline \text{List-I (Electromagnetic waves)} & \text{List-II (Wavelength range)} \\ \hline \text{(A) X-rays} & \text{(I) 1mm to 700 nm} \\ \hline \text{(B) Radio waves} & \text{(II) 0.1m to 1 mm} \\ \hline \text{(C) Infrared waves} & \text{(III) 1nm to \(10^{-3}\) nm} \\ \hline \text{(D) Microwaves} & \text{(IV) > 0.1 m} \\ \hline \end{array}\]
Choose the correct answer from the options given below:

• (A) - (IV), (B) - (II), (C) - (III), (D) - (I)
• (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Memorize the electromagnetic spectrum sequence using a mnemonic, for example: "Rich Men In Vegas Use X-ray Guns" (Radio, Microwaves, Infrared, Visible, Ultraviolet, X-rays, Gamma rays). This gives the order of decreasing wavelength and increasing frequency/energy.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question requires knowledge of the electromagnetic spectrum, which arranges different types of electromagnetic waves in order of their wavelength (or frequency). We need to match each type of wave with its approximate wavelength range.

Step 2: Detailed Explanation:
Let's recall the order of the EM spectrum from shortest to longest wavelength: Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio waves.
(A) X-rays: These have very short wavelengths, shorter than ultraviolet light. The given range (III) 1 nm to \(10^{-3}\) nm (or 1 picometer) is the characteristic range for X-rays. So, (A) matches (III).
(B) Radio waves: These have the longest wavelengths in the electromagnetic spectrum. The range (IV) $>$ 0.1 m correctly describes radio waves. So, (B) matches (IV).
(C) Infrared waves: These waves have wavelengths longer than visible red light (which is around 700 nm). The range given in (I) 1 mm to 700 nm is the accepted range for infrared radiation. So, (C) matches (I).
(D) Microwaves: These are located between infrared waves and radio waves. The range (II) 0.1 m to 1 mm fits the microwave region. So, (D) matches (II).

Step 3: Final Answer:
The correct matching is:
- (A) \(\rightarrow\) (III)
- (B) \(\rightarrow\) (IV)
- (C) \(\rightarrow\) (I)
- (D) \(\rightarrow\) (II)
This combination corresponds to option (D).