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    I have attached a link with a question on waves i am stuck on,

    http://www.aqa.org.uk/qual/gceasa/qp...W-QP-JUN07.PDF

    i have done question 3 a and b but am stuck with part C to the question.

    I calculated the wavelength would be 24 x 10^-3 m and consided using
    wavespeed = frequency x wavelength but still cant seem to be able to work out the frequency because i dont know what the wavespeed is.

    thanks if you can help, i dont quite understand how the markscheme gets the answer of 10Hz,
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    actually ive just got it right,
 
 
 
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