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# Physics wave help watch

1. We done an experiment on making waves in water recently. We lifted up water tank and timed the time for waves to make certain number of cycles. The teacher worked the wave speed by dividing the time by the height we lifted up, why did he do that?
2. (Original post by Janej77)
We done an experiment on making waves in water recently. We lifted up water tank and timed the time for waves to make certain number of cycles. The teacher worked the wave speed by dividing the time by the height we lifted up, why did he do that?
I am not too usre what you meant by "the height we lifted up", but here is some (hopefullly) relevant explanation what you were doing and the ueqaution that your teacher was using.

http://www.physicsclassroom.com/clas...-Wave-Equation

I think the equation your teacher did is speed=wavelength/period.
3. (Original post by stoyfan)
I am not too usre what you meant by "the height we lifted up", but here is some (hopefullly) relevant explanation what you were doing and the ueqaution that your teacher was using.

http://www.physicsclassroom.com/clas...-Wave-Equation

I think the equation your teacher did is speed=wavelength/period.
We lifted the water tank to create waves. Wouldn’t wavelength be the horizontal distance not the vertical?

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