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