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Standing Sound Waves

  • Thread starter dals2002
  • Start date
12
0
[SOLVED] Standing Sound Waves

What are the three longest wavelengths for standing sound waves in a 121 cm long tube that is (a) open at both ends and (b) open at one end, closed at the other?


the wavelength equation that i used for open-open was [tex]\lambda[/tex]= 2L/m; where m is the number of modes (m=1,2,3,4.....)

and then for open-closed [tex]\lambda[/tex]= 4L/m; where m is the number of modes (m=1,3,5,7......)

so i have the length, but the one question that i have about this problem is could i start with the lowest number of modes, but if that is true then why ask for the three longest wavelength, so i am kind of lost if anyone could give me a clue on what to do

thanks in advance
 

Answers and Replies

458
0
The three longest wavelengths correspond to the three lowest modes.
 
12
0
oh ok, that was exactly what i thought it was thanks
 

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