Bats are able to locate flying insects by emitting ultrasonic waves of frequency 82.52 kHz, which are then detected upon

[answerhappygod]

Bats are able to locate flying insects by emitting ultrasonic
waves of frequency 82.52 kHz, which are then detected upon
reflection (as echoes) from their prey.
Consider a bat flying with
velocity 𝑣𝑏𝑎𝑡=9𝑚𝑠−1vbat=9ms−1 as it chases a moth that
flies away from the bat with velocity 𝑣𝑚𝑜𝑡ℎ=8𝑚𝑠−1vmoth=8ms−1.
The speed of sound in air is 340𝑚𝑠−1340ms−1.
a) What is the frequency of the ultrasonic waves detected
by the moth? (3 marks)
b) What frequency does the bat detect in the returning
ultrasonic echo from the moth? (3
marks)