Question

Bats perform echolocation by sending out cries and gathering information about their surroundings based on the echoes that return back to them. The incoming direction of the echoes helps determine where things are located. The time it takes for the echoes to return relates to how far various objects are away. By the intensity and sonar aperture of the returning signal they can also tell information about the size of the objects. The Vespertilionidae family of bats emit short chirps that last about 3 ms with a time interval between chirps of 70 ms. What is the farthest distance, d, a bat can detect an object?

Answer 1

chirping sounds last for time =3ms = 0.003s

this is time for sound to go to distance d and come back .

so time taken for sound to reach distance d ,

time t= 0.003/2=0.0015 s

speed of sound v=343m/s

as distance= speed x time

d=vt= 343x 0.0015 =0.5145 m

the farthest distance is 0.5145 meters

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