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17 Cards in this Set

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Pitch

How high or low sound frequencies appear to be

Infrasonic

Sound pitch too low to be heard by the human ear, that is, below 20 hertz

Ultrasonic

Sound frequencies above 20,000 hertz, the normal upper limit of human hearing

Compression

A pulse of compressed air (or other mater); opposite of rarefaction

Rarefaction

A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression

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

Forced Vibration

The vibration of an object that is made to vibrate by another vibrating object that is nearby.

Resonance

When the frequency of a forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude occurs

Beats

A periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together

All sounds originate in the ______ of material objects

Vibrations

As a source of sound vibrates, a series of _______________ travel outward from the source

Compressions and rarefactions

Sound travels in

Solids, liquids, and gases

The speed of sound in a gas depends on

The temperature of the gas and the mass of the particles in the gas

The speed of sound in a material depends on

The material's elasticity

Sound intensity is

Objective and is measured by instruments

Loudness is a

Physiological sensation sensed in the brain

An object resonates when

There is a force to pull it back to its starting position and enough energy to keep it vibrating