I Mechanical waves Homework

Hello everyone I couldn't figure it out a simple way to solve 15. 11 C . Please help ! Very appreciated!!!
IMG_1473379604.604801.jpg
 

Simon Bridge

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What have you tried?
 
Thank you so much for your attention ,Actually I do not have a clue how o do it . My instructor said the way to solve it is very complicated. So can you give me a hint or tell how to do that .Thank you again .
 

olivermsun

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Suppose you are looking at a wave traveling past you. What does wave speed mean, in relation to what you are seeing?

Now how does the figure relate to the wave speed?
 

Simon Bridge

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I don't think it is complicated so much as requires that you understand the physics somewhat.
ie. how would you normally be able to find out the speed of something - say, a car?
 
The distance / time = velocity . But I do not jab the time here .
 

berkeman

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Thread locked. @Simon Bridge -- please PM the OP and explain the PF Homework Help rules.
 

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