In a location where the speed of sound is 354 m/s, a 2 000-Hz sound wave impinges

Question:

In a location where the speed of sound is 354 m/s, a 2 000-Hz sound wave impinges on two slits 30.0 cm apart.
(a) At what angle is the first maximum located?
(b) What If? If the sound wave is replaced by 3.00-cm microwaves, what slit separation gives the same angle for the first maximum?
(c) What If? If the slit separation is 1.00 3m, what frequency of light gives the same first maximum angle?