Loudness of a sound depends mostly on the:
AFrequency of vibration
BAmplitude of vibration
CDirection of vibration
DTime period of vibration
Answer & Solution
Correct answer: B. Amplitude of vibration
A larger amplitude means the vibrating body swings further from its rest position, transferring more energy to the surrounding medium — and producing a louder sound. The chapter states: loudness is proportional to the SQUARE of the amplitude. So doubling the amplitude makes the sound four times as loud.
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