Pitch (whether a sound is shrill or deep) depends mostly on the:
ASpeed of sound in air
BLoudness in decibels
CAmplitude
DFrequency
Answer & Solution
Correct answer: D. Frequency
Pitch is the highness or lowness of a sound; it is determined by frequency. High frequency → high pitch (whistle, bird), low frequency → low pitch (drum, lion's roar). Loudness depends on amplitude — and is a separate property.
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