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 the lists: List - I List - II (I) Doublet of sodium (A) Visible radiation (II) Wavelength (B) Microwave corresponding to temperature associated with the isotropic radiation filling all space (III) Wavelength emitted by (C) Short radiowave atomic hydrogen in interstellar space (IV) Wavelength of radiation (D) X - rays arising from two close energy levels in hydrogen (a) (I)-(A), (II)-(B), (III)-(B), (IV)-(C) (b) (I)-(A), (II)-(B), (III)-(C), (IV)-(C) (c) (I)-(D), (II)-(C), (III)-(A), (IV)-(B) (d) (I)-(B), (II)-(A), (III)-(D), (IV)-(A)

Answer: (b). Sodium doublet ( 589.0, 589.6 nm): visible (A). Cosmic background radiation filling all space ( T ≈ 2.7 K, λ ~ 1 mm): microwave (B). Atomic hydrogen in interstellar space emits the 21 cm line: short radiowave (C). Two very close (hyperfine) levels in hydrogen give the same 21 cm line: short radiowave (C). So the answer is (b) (I)-(A), (II)-(B), (III)-(C), (IV)-(C).

Match the List - I (Phenomenon associated with electromagnetic… | JEE Main 2014 (11 Apr, Shift 1)

Q28JEE Main 2014 · 11 APR · SHIFT 1Medium

Electromagnetic Spectrum & Atmosphere

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 the lists:

List - I	List - II
(I) Doublet of sodium	(A) Visible radiation
(II) Wavelength	(B) Microwave
corresponding to
temperature associated
with the isotropic
radiation filling all space
(III) Wavelength emitted by	(C) Short radiowave
atomic hydrogen in
interstellar space
(IV) Wavelength of radiation	(D) X - rays
arising from two close
energy levels in hydrogen

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Answer: (b)

Sodium doublet ( $589.0$ , $589.6\ \text{nm}$ ): visible (A).
Cosmic background radiation filling all space ( $T \approx 2.7\ \text{K}$ , $\lambda \sim 1\ \text{mm}$ ): microwave (B).
Atomic hydrogen in interstellar space emits the $21\ \text{cm}$ line: short radiowave (C).
Two very close (hyperfine) levels in hydrogen give the same $21\ \text{cm}$ line: short radiowave (C).
So the answer is (b) (I)-(A), (II)-(B), (III)-(C), (IV)-(C).

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Electromagnetic Spectrum & Atmosphere question from JEE Main 2014 (11 Apr, Shift 1)

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