HardPhysicsHigh School (9–10)GeneralWaves & Sound › Sound Waves and HearingNumerical

A sound travels 2040 m in water, where its speed is 1500 m/s.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A sound travels $2040\ \text{m}$ in water, where its speed is $1500\ \text{m/s}$ . Another sound travels the same $2040\ \text{m}$ in air, at $340\ \text{m/s}$ . Find the time in each, and the difference between the two times.

Need a reminder? The key ideaShow

Speed $v = \dfrac{d}{t}$ . Sound travels at about $340\ \text{m/s}$ in air, $1500\ \text{m/s}$ in water and $5100\ \text{m/s}$ in steel. In air, $v \approx (331 + 0.6T)\ \text{m/s}$ with $T$ in $^\circ\text{C}$ .

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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← Sound travels at 343 m/s in air, 1498 m/s in water and 5950 m/s in iron.For each change, say if it changes the loudness or the pitch of the sound. →

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