You were pitching a baseball game on a beautiful 24°C day when a baseball equipped with a loud buzzer came flying
directly toward you at a speed of 81 km/h. You saw the ball just in time to duck so it flew straight over your head.
Using your cellphone, you then determined that the buzzing sound from the retreating ball had a frequency of 459 Hz.
(a) Find the speed of sound in the air.
Cair 345.8
m/s
(b) What speed should you use for the moving ball?
Vball
=22.5 m/s
(c) At what frequency is the ball actually buzzing?
fball=
(d) What frequency did you hear when the ball passed directly overhead?

foverhead=
(e) What frequency did you hear as the ball was moving toward you?
ftoward

(f) What is the size of the approximate doppler shift?
fD≈