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Say if each sound is infrasound, audible or ultrasound for a person: 8 Hz, 640 Hz, 19 000 Hz, 42…

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Say if each sound is infrasound, audible or ultrasound for a person: $8\ \text{Hz}$ , $640\ \text{Hz}$ , $19\,000\ \text{Hz}$ , $42\,000\ \text{Hz}$ . For the audible ones, find the wavelength in air. (Speed of sound $340\ \text{m/s}$ )

Need a reminder? The key ideaShow

Loudness depends on the amplitude, pitch on the frequency, and quality on the mixture of frequencies. People hear about $20\ \text{Hz}$ to $20\,000\ \text{Hz}$ : below is infrasound, above is ultrasound.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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