Posted by **Emily** on Friday, December 7, 2012 at 11:50pm.

Two pipes, equal in length, are each open at one end. Each has a fundamental frequency of 475 Hz at 297 K. In one pipe the air temperature is increased to 304 K. If the two pipes are sounded together, what beat frequency results?

- physics -
**drwls**, Saturday, December 8, 2012 at 9:59am
The speed of sound is higher by a factor sqrt(475/297) = 1.265 at the higher temperature.

Frequency = (wave speed)/(wavelength)

Fundamental wavelength will not change with T because it depends upon pipe length.

If the cooler-air pipe has a fundamental frequency of 475 Hz, it will be 475*1.265 = 600.1 Hz at the higher temperature.

The beat frequency will be 600 - 475 = 125 Hz.

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