Question

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

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

Hint:

To easily match electromagnetic frequencies:
- Remember the order of increasing frequency: Radio waves $<$ Microwaves $<$ Infrared waves $<$ Light waves.
- Align this order with the frequency units: KHz/GHz $\rightarrow$ GHz $\rightarrow$ GHz/THz $\rightarrow$ THz.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks to match different types of electromagnetic waves used as transmission media in computer networks (List-I) with their corresponding operational frequency ranges (List-II).

Step 2: Key Concepts and Spectrum Ranges:
- Wireless transmission media transmit electromagnetic signals through the air.
- Different bands of the electromagnetic spectrum are allocated to different technologies based on their frequency ranges.

Step 3: Detailed Explanation of Matching:
- Radio waves: These are electromagnetic waves in the lowest frequency band of the communication spectrum. Their standard frequency range is from $3\text{ KHz}$ to $1\text{ GHz}$. Thus, C matches with I.
- Microwaves: These waves operate at higher frequencies than radio waves, enabling them to transmit more data. Their standard frequency range is from $1\text{ GHz}$ to $300\text{ GHz}$. Thus, D matches with III.
- Infrared waves: These high-frequency waves are used for short-range communication (like remote controls) and operate in the range just below visible light, from $300\text{ GHz}$ to $400\text{ THz}$. Thus, B matches with II.
- Light waves (Visible Light): These have the highest frequency among the listed options, ranging from $400\text{ THz}$ to $900\text{ THz}$. Thus, A matches with IV.
- Combining these matches: A-IV, B-II, C-I, D-III.

Step 4: Final Answer:
The correct matching sequence is A-IV, B-II, C-I, D-III.
Hence, option (C) is the correct choice.