Discussion
Match List-I with List-II and select the correct option using the codes given below :
| List I (Name) | List II (Wavelength) |
|---|---|
| (a) Microwave | (1) 8-9.2 µm |
| (b) Near Infrared wave | (2) 0.3-0.4 µm |
| (c) Ultraviolet wave | (3) 7.5-11.5 µm |
| (d) Thermal wave | (4) 0.77-0.91 µm |
Answer: A
The key's matching is a-3, b-4, c-2, d-1.
Two pairs are clear: ultraviolet lies at 0.3-0.4 µm (c-2) and the near infrared band at 0.77-0.91 µm (b-4). Only one option contains both, and it pairs thermal infrared with 8-9.2 µm (d-1), which is a thermal band.
That leaves 7.5-11.5 µm for microwave, but that range is also thermal infrared: true microwaves are far longer, about 1 mm to 1 m. The item's list does not include a real microwave range, so the key is reached by elimination from the two certain pairs.
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