Waves passing a logWatch
I'm having trouble knowing where to start with this, questions any help welcome.
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
Thanks for the information. I see how you get the frequency now, which is where I was getting stuck.