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Q.

Match the articles given in column I with the articles in column II.

Matrix:

Column I

Column II
(a)
loudness
(i)
hertz
(b)
wavelength
(ii)
decibel
(c)
frequency
(iii)
meter

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a

a-iv; b-ii; c-i

b

a-ii; b-iii; c-i

c

a-iv; b-ii; c-iii

d

a-i; b-ii; c-iii

answer is B.

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Detailed Solution

Decibels are used to measure loudness. Since the decibel scale is logarithmic, loudness does not correspond to sound intensity.
A wavemeter, sometimes known as a wavelength meter, is a type of interferometer used to measure the precise wavelength of laser-beam-delivered light.
A Hertz is a unit of frequency that measures changes in state or cycles in cyclical waveforms like sound waves, alternating currents, and other waveforms.

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