Bats emit sounds of frequencies around 35.0 kHz and use echolocation to find their prey. If a bat is moving at the speed of 12.0 m/s toward an insect at an air temperature of 20.0oC, (assume the insect and air are still)
(a) What frequency is heard by the insect?
(b) What frequency is heard by the bat from the reflected sound?
(c) Would the speed of the bat affect the answers?