When we change feeble sound to loud sound we increase its

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Frequency

Amplitude

Velocity

Wavelength

answer is B.

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Detailed Solution

Concept: Loudness is proportional to amplitude . if the amplitude is high the sound will be loud if the amplitude is less the loud will be less.
Frequency of sound is the number of vibrations per second. Its unit is hertz . Speed of sound is the distance travelled by sound / unit time.
Wavelength of sound is the distance between two crests or two troughs.
The larger the amplitude the louder the sound and the more energy the sound waves contain .Hence, when we change feeble sound to loud sound we increase its amplitude.
Hence, the correct option is 2.

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