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A wave question

Primarygun
in Homework Help

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In the figure, describe the motion of particles X and Y at the instant.

What will be the shape of the string after 1/4 cycle?

I don't know which direction that the crests are travelling as there are two sources.

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I haven't learnt standing wave yet. Can you tell me what it is?

a straight line resulted?

A standing wave has fixed nodes, and only certain wavelengths are allowed - a half-integral number of wavelengths have to fit. That's because all other wavelength waves will destructively interfere.

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