| A | B |
|---|
| repeated echoes or sound | reverberation |
| the change in frequency of a sound due to motion of the source | Doppler effect |
| the bending of wave around a barrier | diffraction |
| the highness or lowness of a sound | pitch |
| the unit to measure the energy or intensity of a sound | decibel |
| the frequency at which an object vibrates due to its material, size, or shape | natural frequency |
| a wave in which the particles travel in the same direction as the wave | compression |
| less dense area of a compressional wave | rarefaction |
| a reflected sound wave | echo |
| human perception of the energy a wave carries | loudness |
| when an object start to vibrate at its natural frequency by absorbing energy from another object vibrating at the same frequency | resonance |
| system of echolocation used to map the bottom of the sea | sonar |
| most dense area of a compressional wave | compression |
| measure of the amount of energy a wave carries | amplitude |
| 343 m/s in air at 20 degrees C. | speed of sound |
| method of navigation and hunting using echoes | echolocation |
