Regular Physics Sound Term Definition

For Sound Unit Test regular phyisics

Equation for Sound Intensity

i=p/4πr²

fundamental frequency

The first harmonic that is also the lowest frequency

Timbre

The quality or richness of a sound (based on the combinations of overtones/harmonics)

Stringed/wind Instruments/open-open Equation

Fn=n v/2L

Open/Closed Equation

Fn= n v/4L

Multiples of fundamentals

Additional waves that can happen on the string/rope (ex, 1, 2, 3)

Natural Frequency

The frequency at witch an object vibrates most easily.

Correlates with:

-Size (larger=lower)

-Shape

-Type of Material

Sympathetic Vibrations

When two objects share the same natural frequencies, vibrations from one are easily transferd to the other.

Resonance

The increase in amplitude by the vibrations

-Happens due to constructive Interference

Beats

Increase/Decrease in intensity (pulses) due to constructive/destructive interference from 2 slightly different frequencies.

Equation for Beats

fB = |f1-f2|

Doppler effect

A change in perceived frequency of sound

Occurs when there is relative motion between the source of sound and the observer

Sound barrier

An Intense compression of air (or a sound wave)

Sonic Boom

A very loud sound (BOOM) due to an intense compression of air

Sound is a ____ wave, also known as a ____ wave

longitudinal, compression

Ultrasonic

Super high frequency above human hearing (20,000hz)

Infrasonic

Below human hearing (20hz)

Range of human hearing, what factors?

20-20,000hz, AGE

Doppler Effect

A change in the perceived frequency of a sound

Compression

When air particles are closer together, in a sound wave

Expansion/rarefaction

When air particles are farther apart, occurring in a sound wave.

Sonic Boom

A very loud sound due to an intense compression of air.