Physics
(a) Which of the following quantity determines the loudness of a sound wave?
(i) wavelength,
(ii) frequency, and
(iii) amplitude.
(b) How is loudness related to the quantity mentioned in the above part (a)
Sound
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Answer
(a) The loudness of a sound wave is determined by the amplitude of the wave.
If two waves have same frequency and same wave form (sine wave), but they differ in amplitude then the loud sound corresponds to the wave of large amplitude.
(b) Loudness is proportional to the square of the amplitude
Loudness ∝ (amplitude) 2
When a body vibrates with a greater amplitude, it sends forth a greater amount of energy and hence the energy received by the ear drum is large, so the sound appears larger.
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