When we change sound to loud sound we increase its

frequency

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amplitude

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velocity

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wavelength

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Solution

The correct option is B amplitude
Loudness depends on the square of the amplitude of the wave.
That is, $l o u d n e s s \propto {(a m p l i t u d e)}^{2}$
Amplitude is the size of the vibration, and this determines how loud the sound is. Larger vibrations make larger amplitude, hence, louder the sound.

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