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Homework Help: Wavelength and Speed of Sound

  1. Mar 1, 2012 #1
    1. The problem statement, all variables and given/known data

    A rhinoceros is calling to her mate using sound wave whose frequency is 5.0 Hz. Her mate is 480 m away. The air is 35°C. How many wavelengths of the sound are between the two animals?

    2. Relevant equations

    v = 331 + (.6)*T
    v = wavelength*frequency

    3. The attempt at a solution

    Find the speed of sound to be 352 m/s.
    Then divide the speed of sound by 5 Hz to get the wavelength, which would be 70.4 m.

    Then divide total distance separating them by wavelength to get # of wavelengths between them:
    480m/70.4m = 6.818 wavelengths.

    Is that solution correct? Also, is that the appropriate way to indicate the # of wavelengths, or is there some type of rounding I should do to it?

    Thanks!
     
  2. jcsd
  3. Mar 1, 2012 #2
    Looks correct. As for the rounding, it's best to ask your teacher/professor what they prefer because they all seem to have their own favourite way. Some may want significant figures, some want 3 decimal places always.
     
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