Shrillness of sound is determined by
Detailed Explanation:
Shrillness (or pitch) of sound is determined by the frequency of the sound wave.
Since frequency is inversely proportional to wavelength (f = v/λ, where v is constant in a given medium), wavelength determines pitch—shorter wavelength means higher frequency and shriller sound.
Amplitude determines loudness, not shrillness, while velocity depends on the medium and does not determine pitch.
Therefore, Option 3 (wavelength) is correct as it is directly related to frequency/pitch.
Question 3 of 4 Sound and Waves
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