Practice Test 12

A moving speaker emits a constant tone while traveling through still air. A stationary detector measures a higher frequency than emitted. Based on the Doppler Effect, which relative motion between speaker and detector is most consistent with this observation?

Two bats emit the same call frequency while flying toward a stationary microphone. Bat 1 flies faster than Bat 2 along the line to the microphone. Based on the Doppler Effect, which outcome is expected for the detected frequencies?