Sound Waves And you.

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Presentation transcript:

Sound Waves And you

Sound waves Longitudinal waves = particle motion in same direction as energy motion Hearing ~ 20 to 20,000 Hz (sound generator) http://plasticity.szynalski.com/tone-generator.htm Loudness = amplitude Pitch = frequency Rubens tube: tone generator and “the lion sleeps tonight”

Closed tube waves 1st mode = ¼ λ node at closed end anti node at open end antinode 1st harmonic (overtone) L = ¼ λ 2nd harmonic L = ¾ λ 3rd harmonic L = 5/4 λ

How can we write a general equation That takes into consideration: ¼, ¾,5/4 … That is similar to the equation we used for waves on a rope? L = n/2 wavelengths

Odd series of #s math relationship L = (2n – 1) /4 λ λ = v/f So the L = (2n – 1) / 4 v/f

Investigation C here

Sound videos https://www.youtube.com/watch?v=Ude8pPjawKI https://www.youtube.com/watch?v=MwsGULCvMBk https://www.youtube.com/watch?v=cK2-6cgqgYA

Acoustics https://www.youtube.com/watch?v=JPYt10zrclQ

Follow up questions A) A Rubens tube filled with propane gas has a measured λ of 1.81m when a tone of 246 Hz is used. What is the speed of the sound wave in the propane? B) The first fundamental frequency is produced in a tube with a measured length of 0.32m and a diameter of 11cm using a 247 Hz tone. What is velocity of the wave in the tube? (do not forget the correction factor!!!)

The answers A) 445 m/s B) 359.6 m/s

More fun questions A) If the temperature of a room filled with air is 32OC (at one atmosphere of pressure), what is the velocity of a sound wave in the room? The answer: 350.2 m/s

Doppler effect here