Match the following physical quantities with their respective SI units.
A
Hz
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B
m
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C
s
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D
dB
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Solution
Wavelength is the distance between two consecutive crests or troughs. Its SI unit is metre (m).
Frequency is the number of oscillations or vibrations per second. Its SI unit is hertz (Hz).
Time taken to complete one oscillation is time period. Its SI unit is second (s).
Loudness of a sound is determined by its amplitude. It is expressed in the unit of decibel (dB).