Sound

The Doppler effect

A change in pitch or wave frequency due to movement.

Natural frequency

A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.

Resonator

A hollow chamber filled with air that amplifies sound when its air vibrates.

Echo

A reflected sound wave.

Drum

A type of percussion instrument.

Overtone

A vibration whose frequency is a multiple of the fundamental frequency.

Music

Created when specific pitches and sound qualities are used deliberately in a set pattern.

Reverberation

Echoing effect produced by many reflections of sound.

Decibels

Measure of the intensity of sound.

Eardrum

Passes sound vibrations to a hammer, anvil, and stirrup.

Loudness

People's perception of sound intensity.

Strings

Plucking, striking, or drawing a bow across tightly stretched strings to make music.

Sound

Produced by vibration. Sound travels faster in solids. Speed of sound depends on the temperature.

Brass and woodwinds

Rely on vibration of air to make music.

Frequency

Something in every natural material.

Ultrasound

Sometime used to examine parts of the body.

Percussion

Struck, shaken, rubbed, or brushed to produce sound.

Sonar

System that uses the reflection of underwater sound waves to detect objects.

Intensity

The amount of energy that flows through a certain area in a specific amount of time.

Sound Quality

The differences among sounds of the same pitch and loudness, uniqueness of instruments at the same note.

Echolocation

The process of locating objects by emitting sounds and interpreting the sound waves that are reflected back.

Acoustics

The study of sound.

Sound waves

They're gathered by the outer ear, amplified by the middle ear, and converted by the inner ear. They have the properties frequency and intensity and wavelength. They can be used deliberately in a pattern to make music. Compressions and rarefactions are kinds of sound waves. Sound waves of high intensity travel farther. Sound waves with a high frequency are interpreted as high pitch. They CANNOT move through a vacuum.

Cochela

Tiny hairs located in the inner ear to conduct sound to the brain.

Pitch

You're registering how high or low the sounds are when you hear a change in pitch.