Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

Suppose I use a tool to create a circular wave in the river. If there are two fish swimming 1m from the source (2m from one another), they will both feel the wave at the same time.

What will happen if the river flows from one fish to the other? How will it affect the waves?

share|improve this question
    
Hi Bob, I can't understand your question..! –  Waffle's Crazy Peanut Sep 16 '12 at 4:00
add comment

1 Answer

Assuming the river is deep enough or equivalently the waves are small enough compared with the depth.

Relatively to the bank the wave will remain its circular form, however as a whole it will be moving with the river. So, assuming the fishes swim against the current to keep stationary relatively to the bank, the upper fish will feel the wave later than the other one.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.