Bats are able to locate flying insects by emitting ultrasonic waves of frequency 82.52 kHz, which are then detected upon
Posted: Mon May 16, 2022 2:31 pm
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 ๐ฃ๐๐๐ก=9๐๐ โ1vbat=9msโ1 as it chases a moth that
flies away from the bat with velocity ๐ฃ๐๐๐กโ=8๐๐ โ1vmoth=8msโ1.
The speed of sound in air is 340๐๐ โ1340msโ1.
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)
waves of frequency 82.52 kHz, which are then detected upon
reflection (as echoes) from their prey.
Consider a bat flying with
velocity ๐ฃ๐๐๐ก=9๐๐ โ1vbat=9msโ1 as it chases a moth that
flies away from the bat with velocity ๐ฃ๐๐๐กโ=8๐๐ โ1vmoth=8msโ1.
The speed of sound in air is 340๐๐ โ1340msโ1.
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)