The calls of echolocating bats are "frequency modulated," meaning that
A)each pulse repeatedly rises and falls in frequency.
B)the rate of pulse production declines as the bat nears an object.
C)the frequency of the pulse is high at the beginning and drops toward the end.
D)the transmission-to-reception time increases as the bat nears an object.
E)None of the choices is correct

Question

Quizplus · Accepted Answer

The calls of echolocating bats are indeed frequency modulated, but this means that the frequency of the pulse is high at the beginning and drops toward the end. This pattern allows the bat to receive more information about its environment, such as the distance and size of objects, and to distinguish between different prey species.

The Calls of Echolocating Bats Are "Frequency Modulated," Meaning That