47. ••• Bats emit sounds of frequencies around 35.0 kHz and use echolocation to find their prey. If a bat is moving with a speed of 12.0 m/s toward a hovering, stationary insect,

(a) what is the frequency received by the insect if the air temperature is 20 °C?

(b) What frequency of the reflected sound is heard by the bat?

(c) If the insect were initially moving directly away from the bat, would this affect the frequencies? Explain.