Unit 4: Sound waves

Loudness

perceived intensity or strength of a sound

amplitude

what does the loudness relate to?

Pitch

Perceived frequency

Quality

Attribute of a sound used to distinguish between sounds with the same fundamental frequency but with different overtones

Sound intensity

the rate of sound energy flowing across a unit area perpendicular to the direction of the wave propagation

No

Does sound travel faster in gases compared to solids and liquids?

Yes

Can sound waves interfere?

Normal

Sound intensity when compressions meet compressions

minimum

Sound intensity when compressions meet rarefactions

Acoustics

Science or nature of sound quality

Beats

periodic changes in sound intensity caused by sound interference from sources of similar frequencies

Harmonics

whole number multiples of the fundamental frequency

resonance

the response of an object that is free to vibrate to a periodic force with the same frequency as the natural frequency

Standing wave

Resonance in a linear air column occurs when a ________________________ pattern is established

1st harmonic

Fundamental frequency

1st overtone

2nd harmonic

2nd overtone

3rd harmonic

Doppler effect

When a source generating sound waves approaches an observer, the pitch increases.

pressure

Sound waves are also __________ waves

Sonic boom

When an object travels faster then sound

Sound barrier

Intense compression of very dense air produced when an object is flying at the speed of sound

Mach Number

Ratio of a moving object’s speed to the speed of sound in air