JEE Main 2014 · 11 Apr · Shift 1 · Physics Q29

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PhysicsList match+4 / -1Question 29 of 90

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

I
Doublet of sodium
II
Wavelength corresponding to temperature associated with the 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 radiowave
D
X - rays

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

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

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

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

Answer and worked solution

Official answer: B

Sodium D doublet: visible.
Cosmic background radiation (about 3 K): microwave.
The 21 cm hydrogen line from interstellar space: short radiowave.
Radiation from two close levels in hydrogen (the hyperfine 21 cm line): short radiowave.

So I-A, II-B, III-C, IV-C.

Topics:Electromagnetic spectrum

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JEE Main 2014 · 11 Apr · Shift 1, Physics question 29