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    I understand how transverse waves with same frequency travelling in opposite direction can create standing waves. But how can longitudinal waves be stationary if they do not have peaks and troughs? Thank you
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    They can be stationary - instead of peaks and troughs they have compressions and rarefactions which add up or cancel out in the same manner as transverse waves. Examples of longditudinal standing waves are the sounds made by wind instruments or pipe organs. Have a wee search online for these and it'll give you a bit of an idea.
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    (Original post by kokopops_y)
    I understand how transverse waves with same frequency travelling in opposite direction can create standing waves. But how can longitudinal waves be stationary if they do not have peaks and troughs? Thank you
    longitudinal and transverse refers to the direction of movement in the particles transmitting the wave... the effect of the longitudinal motion of the particles is a progressive pressure wave with peaks and troughs (of pressure)... and if you reflect the wave it'll superpose a lot like transverse waves going through a string or waves on a water surface would.

    classic demo is the Rubens tube...
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    Joinedup, Teenie2 thank you so much! :adore::adore::adore:
 
 
 
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