Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    17
    ReputationRep:
    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
    Offline

    10
    ReputationRep:
    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 = ?.
    • Thread Starter
    Offline

    17
    ReputationRep:
    (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
    Offline

    10
    ReputationRep:
    (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.
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.