- Standing Waves in Strings and Organ Pipes
- Fundamental Mode and Harmonics
- fundamental mode or the first harmonic, second harmonic
A bat is flitting about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the bat is 40 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.03 times the speed of sound in air. What frequency does the bat hear reflected off the wall?