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Q28. Match the List-I (Phenomenon associated with electromagnetic radiation) with List-II (Part of electromagnetic spectrum) and select the correct code from the choices given below this lists: List I I Doublet of sodium radiation II Wavelength corresponding to temperature associated with isotropic radiation filling all space III Wavelength emitted by atomic hydrogen in interstellar space IV Wavelength of radiation arising from two close energy levels in hydrogen List II (A) Visible radiation (B) Microwave (C) Short radio wave (D) X-rays

1. (I)-(A), (II)-(B), (III)-(D), (IV)-(C)
2. (I)-(A), (II)-(B), (III)-(C), (IV)-(D)
3. (I)-(D), (II)-(C), (III)-(A), (IV)-(B)
4. (I)-(B), (II)-(A), (III)-(D), (IV)-(A)

Correct answer: (I)-(B), (II)-(A), (III)-(D), (IV)-(A)

Solution

The correct option matches each phenomenon with its corresponding part of the electromagnetic spectrum: the doublet of sodium radiation is in the microwave range, isotropic radiation corresponds to visible light, atomic hydrogen emissions are in the X-ray range, and the close energy levels in hydrogen produce visible radiation.

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