Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
A sound in a pipe filled with helium has a frequency of and a wavelength of . What is the speed of sound in the helium?
Frequency (waves each second, in ), time period , wavelength (compression to compression), and . The medium sets ; the source sets .
Have you tried it?
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, compare your working with the solution.
Step 1. .
Answer: , almost three times as fast as in air: helium is a very light gas.
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