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Frequency, speed of sound

  1. Feb 6, 2010 #1
    1. The problem statement, all variables and given/known data

    A 256 Hz tuning fork produces the first harmonic in a tube filled with air and having one closed and one open end. If the tube were filled with helium where the speed of sound is 965 m/sec, what frequency would be needed to produce the first harmonic? Assume the speed of air at the same temperature is 330 m/sec.

    2. Relevant equations

    v=lambda*f

    3. The attempt at a solution
    I have tried:

    f=256 Hz, speed of helium=965m/s
    lambda=v/f=965/256=247040m
    f=v/lambda=965Hz/247040m=0.0039Hz
     
  2. jcsd
  3. Feb 6, 2010 #2
    Simple calculus error. you don't expect the result of division of two numbers in the same order of magnitude be 3 orders of magnitudes away.
    Just get your calculator, and push those buttons carefully.

    We all make silly mistakes. I am writing small scripts for all serious calculations, and carefully observe all intermediate results for sanity.
    Still most of my calculations have problems. I have lost my old rigidity in math. You are just gaining it.
     
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