# Waves passing a log

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#1
Dear All,

I'm having trouble knowing where to start with this, questions any help welcome.

Many thanks
Bob
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1 month ago
#2
You need to use wavespeed = frequency x wave length , you know N is the number of wave crests per unit time , 2 wave crests is one wave 3 wave crests is 2 waves so frequency is (n-1) , you can work out the wavelength using the amount waves in the length of the log so L divided by the number of waves in the length of the log. I would go with answer B
0
#3
(Original post by Haywood1743)
You need to use wavespeed = frequency x wave length , you know N is the number of wave crests per unit time , 2 wave crests is one wave 3 wave crests is 2 waves so frequency is (n-1) , you can work out the wavelength using the amount waves in the length of the log so L divided by the number of waves in the length of the log. I would go with answer B
Dear Haywood,

Thanks for the information. I see how you get the frequency now, which is where I was getting stuck.
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