A tuning fork vibrates at a frequency of 256 Hz.

Question

When the air temperature increases, the wave-length of the sound from the tuning fork (1) increases (2) remains the same, or (3) decreases. Why?

If the temperature rises from 0 degrees C to 20 degrees C, what is the change in wavelength?

Answer 1

speed = wavelength * frequency

So if you hold frequency constant, wavelength is directly proportional to speed.

So wavelength at 0C = wavelength at 20C * speed at 0C / speed at 20C

Here's a handy formula you can use to calculate how the speed changes with temperature.

http://en.wikipedia.org/wiki/Speed_of_so...