The calls of echolocation 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 the 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.

Question

Quizplus · Accepted Answer

The calls of echolocation bats are "frequency modulated," which means that the frequency of the pulse starts off high and gradually drops toward the end. This allows the bat to determine the distance of objects by analyzing the time it takes for the sound to return to their ears.

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