Eardrum

• Membrane that vibrates the bones of the middle ear.

Cochlea

• Fluid-filled structure of the inner ear that contains hair cells.

Intensity

• Amount of sound energy that flows through a given area at a given time

• Beethovoven’s music had a lot of intensity.

Loudness

• The way the brain perceives the intensity of a sound. IPods are usually played loudly.

Frequency

• Frequency is a measure of the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event. So the period is the reciprocal of the frequency.

Pitch

• The highness or lowness of a sound.

• Opera singers can have a high pitch or a low pitch.

Ultrasonic waves

• Sounds with frequencies above 20,000 Hz

Doppler Effect• The change in pitch of a

sound caused by motion of either the sound source or reciever.

Noise

• noise means unwanted sound or noise pollution.

• Kids can make a lot of unwanted noise.

Quality

• Difference between sounds of the same frequency caused by overtones.

Music

• A combination of sounds and distinct pitches following a specified pattern.

Overtones

• Multiples of the fundamental frequency

Resonator

• The part of the violin that amplifies the sound of the strings

Echo• A true echo is a single

reflection of the sound source. The time delay is the extra distance divided by the speed of sound.

• If so many reflections arrive at a listener that they are unable to distinguish between them, the proper term is reverberation

Reverberation

Unpleasant echo effect caused by many by different circumstances (happens in caves),

Acoustics

• The study of sound

Echolocation

• Finding objects by emitting sound waves and interpreting the reflected sound.

Sonar

• Used to locate objects underwater by reflection of sound waves.