A tuning fork vibrates at a frequency of 256 Hz. (a) When the air temperature increases, the

Question:

A tuning fork vibrates at a frequency of 256 Hz.
(a) When the air temperature increases, the wavelength of the sound from the tuning fork (1) increases, (2) remains the same, (3) decreases. Why?
(b) If the temperature rises from 0 oC to 20 oC, what is the change in the wavelength?