Question 20: EM waves

Question

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

Accepted Answer

(I) These have a wavelength of 589 nm Ã¢ÂÂ 589.6 nm that corresponds to visible light in the yellow region.
The correct matching is (I)-(A), Visible radiation. The given wavelength range falls within the visible spectrum.
(II) The temperature is 2.7 K, which corresponds to the emission of microwaves.
The correct matching is (II)-(B), Microwaves. The given temperature corresponds to the cosmic microwave background radiation.
(III) The wavelength associated is 21 cm, which corresponds to radiowaves of short wavelength.
The correct matching is (III)-(C), Short radiowave. The given wavelength of 21 cm falls within the range of radiowaves.
(IV) This radiation has a frequency of 1,057 MHz, which corresponds to radiowaves of high frequency or short wavelength.
The correct matching is (IV)-(B), Microwaves. The given frequency falls within the microwave range.
Therefore, the correct answer is Option B : (I)-(A), (II)-(B), (III)-(C), (IV)-(B).

Answer

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

Answer

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

Answer

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

Answer

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

EM waves

Choose the correct answer: