Asked by kate

The distance between two successive crests of a certain transverse wave is 1.13 m. 20 crests pass a given point along the direction of travel every 18.6 s.
Calculate the wave speed. Answer in units of m/s.

So far I have gotten 1.22 for my answer by 20/18.6 x 1.13. I also tried 24.3 and that didn't work so I don't know what to do.
Answered by bobpursley
wave speed=distance/time=1.13/(18.6/20)
or
= 20*1.13/18.6 m/s
Answered by kate
That gives me the wrong answer according to the website
Answered by bobpursley
it is correct, wonder if they are counting 20 as one sig digit? Who knows.
Answered by Scott
do they start timing at a crest?

there are 19 wavelengths between 20 crests
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