A bat is calling at 56,000 Hz, but the echo returning is coming back at 56,005 Hz.Based on what you know about bat biosonar, which of the following statements is TRUE?
A)The bat is approaching a target.
B)The bat is following a relatively large target.
C)The bat is using a CF-FM call.
D)The bat is staying the same distance from the target.

Question

Quizplus · Accepted Answer

The difference in frequency between the call emitted by the bat and the echo received indicates a Doppler shift, which occurs when the bat and the target are moving relative to each other. Since the frequency of the echo is higher than the call, it means the bat is approaching the target, causing the sound waves to compress and thus increase in frequency.

A Bat Is Calling at 56,000 Hz, but the Echo