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What is the frequency range of sound produced at the closure of aortic and pulmonic valves?

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What is the frequency range of sound produced at the closure of aortic and pulmonic valves?

(a) less than 0 Hz

(b) 0 to 30 Hz

(c) 30 to 100 Hz

(d) above 100 Hz

This question was posed to me in my homework.

Question is from Measurement of Temperature topic in division Patient Monitoring System of Biomedical Instrumentation

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The correct option is (d) above 100 Hz

Easiest explanation: The second sound is higher in pitch than the first, with frequencies above 100 Hz and the duration between 25 to 50 ms. This sound is produced by the slight back flow of blood into the heart before the valves close and then by the closure of the valves in the arteries leading out of the ventricles. This means that it occurs at the closure of aortic and the pulmonic valves.

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