| A | B |
|---|
| Sound Wave | a longitudinal wave that is caused by vibrations and that travels through a material medium |
| Medium | is a substance through which a wave can travel |
| Pitch | how low or high a sound seems to be is the pitch of that sound. |
| Doppler Effect | an observed change in the frequency of a wave when the source or observer is moving. Is the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound. |
| Loudness | is a measure of how a sound can be heard. |
| Decibel | the most common unit used to express loudness is the decibel (dB) |
| Reflection | is the bouncing back of a wave after it strikes a barrier |
| Echo | a reflected sound wave |
| Echolocation | the use of reflected sound waves to find objects |
| Interference | happens when two or more waves to find objects |
| Constructive Interference | as the compressions of one wave overlap the compressions of another wave, the sound will be louder because the amplitude is increased. |
| Destructive Interference | as the compressions of one wave overlap the rarefactions of another wave, the sound will be softer as the amplitude is decreased. |
| Sonic Boom | is the explosive sound heard when a shock wave reaches your ears. |
| Standing Wave | is a pattern of vibration that looks like a wave that is standing still. |
| Sound Quality | the result of severalpitches mixing together through interference. |
| Noise | can be described as any sound, especially a nonmusical sound, that is a random mix of frequencies (or pitches). |
| outer ear | the pinna collects and directs sound waves into the ear canal. |
| middle ear | hammer,anvil,and stirrup act as levers to increase the size of the vibrations. |
| nner ear | where electrical signals are sent to the brain. |
