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# AS Physics Waves Exam Question - please explain how I do it watch

How do I do this question: b)iii) Calculate the difference in the value for the speed of sound between day one and day two obtained from these results.

I'm guessing the 80m at the start of the question is significant, but I don't know whether 80m is the wavelength, or 80m is half a wavelength, or two wavelengths. Can you explain it to me please? Also, how do I do it? I don't know the frequency, so I can't work out the speed.
2. (Original post by vector12)

How do I do this question: b)iii) Calculate the difference in the value for the speed of sound between day one and day two obtained from these results.

I'm guessing the 80m at the start of the question is significant, but I don't know whether 80m is the wavelength, or 80m is half a wavelength, or two wavelengths. Can you explain it to me please? Also, how do I do it? I don't know the frequency, so I can't work out the speed.
Speed=distance/time

The distance is 80m, the time is given in the table.

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