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    A loudspeaker points directly at a wall 3m away. It emits a wave of frequency 680Hz and a standing wave is formed.

    Is this the correct way to work this out?

    v=fλ

    340/680=λ

    λ=1/2

    λ=2L - I'm assuming this is the frist harmonic, even though it doesnt state. Is this normal?

    L=0.5/2

    L=0.25
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    If it is first harmonic, the length of the string is 2 times the wavelength. Therefore L = 2λ, L/2 = λ. Now sub in ya values so L = ?.
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    (Original post by assassinjeev22)
    If it is first harmonic, the length of the string is 2 times the wavelength. Therefore L = 2λ, L/2 = λ. Now sub in ya values so L = ?.
    shouldn't it be λ=2L and L=λ/2
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    (Original post by joyoustele)
    shouldn't it be λ=2L and L=λ/2
    Oh yeah sorry got abit muddled up there my apologies

    Other than that yeah all seems good but they usually do state if its first harmonic(aka fundamental frequency), 2nd harmonic etc.
 
 
 
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