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Three phyphoxphones and superposition
#7
Hi Erik,

I realized some measurements of the classical interference of (sound) waves from two "point" sources (headphones) from a smartphone using "Tone generator" of phyphox. In order to have a stronger sound I have added a small HiFi headphone amplifier as you can see on the given photo.  The result of the interference measurements by a second smartphone with "Audio amplitude" of phyphox is not so bad. It could be better but somebody from a nearby laboratory was not too much happy hearing (reasonably) amplified 4000 Hz. For comparison I have calculated the expected interference pattern for exactly the same parameters:
  • Speed of sound Cair = 344 m/s
  • Frequency f = 4000 Hz
  • Wavelength (from previous two) = 8.6 cm
  • Distance between sources L = 54 cm
  • Distance from the sources to the measurement line d = 69.5 cm
  • Interval of measurements (second phone scan) x from -50 cm to + 50 cm
Knowing the time interval of measurements (with constant speed of the phone) one can recalculate time to x.
Additionally a small modification of the "Audio amplitude" was done to see the sound intensity in the direct scale (also attached here). Unfortunately, I had to keep only French and German translations because somewhere in many others an error existed and I could not find it.

Enjoy
Mikhail


Attached Files Thumbnail(s)
       

.pdf   interference_2sources_54x70.pdf (Size: 35.35 KB / Downloads: 147)
.phyphox   audio_amplitude2.phyphox (Size: 23.79 KB / Downloads: 131)
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Messages In This Thread
RE: Three phyphoxphones and superposition - by solid - 10-05-2021, 08:06 PM

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