Unit 12: Physics.

47 terms by MayaNicole 

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What are multiple echoes called ?

reverberations

"Dead spots" in an auditorium are the results of

destructive interference

Twice the freq of a musical note

octave

The pitch of a wind instrument depends on the ____ of the air column

length

the fundamental mode plus overtones is

harmonics

the freq of the ___ overtone of a 100 Hz note is 600 Hz

fifth

Mixture of sound freq w/ a pattern is

Music

the ___ mode determines the pitch of a musical sound

fundamental

whole number multiples of the fundamental mode

overtones

This is a pulsing sound as the result of interference of sound waves of slightly different frequencies

beats

the first overtone of a note is the _____

second

random mix of many sound frequencies

noise

sound ___ depends on the number and relative intensity of harmonics

quality

the bending downward of sound waves as they move into a layer of cool air is an example of

refraction

decreasing the ___ of a vibrating sting lowers the pitch

tension

when tuning fork matches the freq of a piano string ___ occurs

resonance

the pitch of a percussion instrument depends on

mass

Speed of sound in air equation ?

v = 331 m/s + (0.6 m/s/c)(t)

Echo equation?

V=2d/t

Velocity equation?

V=FY

Intensity equation?

I=P/A

Sound waves are ______, ______ waves

mechanical , longitudinal

Sound waves consist of ____ and ____ rather than crests and troughs

compressions and rarefractions

The velocity of a sound wave depends on the ____

medium

The upper limit of sound intensity is called the threshold of ____

pain

THe lower limit of sound intensity is called the threshold of ____

hearing which is 1.0 X 10^-12 w/m^2 at 1000 Hz

Compared to speed of light, sound is much ____ and compared to energy of light, sound is much _____

slower, less

sound waves cannot travel thru a ____

vacuum

Of the 3 phases of matter, sound travels fastest in

solids

Sound travels slowest in ___

gases

sound travels ___ in hot air then cold air

faster

The ____ range of freq for the avg human is ___

audible, 20-20,000

Sounds of higher freq are called

ultrasonic

sounds of lower freq are called

infrasonic

the ____ is the dimensionless unit for B which is relative ____

dB, intensity

sound intensity is ____ divided by ___ and the best measure of loudness

power, areas

sound intensity _____ as the distance from the source increases

decreases

change in pitch of a sound as the source and observer move towards or away from ech other is __

doppler effect, used for tracking storms and car speed direction

____ occurs when an outside force matches the ___ freq of an object, result is dramatic increase in ___ of waves

resonance, natural, amplitude

____ can be heard when two tuning forks of diff freq are sounded together. this results from constructive and destructive interference of the two sound waves produced

Beats

echoes are ___ sound waves, and ___ are multiple echoes

reflected, reverberation

___ - one is the speed of sound

Mach

A ____ plane travels faster than sound

supersonic

Trailing behind a supersonic plane is a ____ shaped region of compressed air producing a ____ ______

cone, sonic boom

To raise pitch of a wind instrument you ___

decrease size of air column

To raise pitch of string instrument you ___

increase tension, increase density, decreased length of string, and diameter decreases

To raise pitch of a percussion instrument you ___

decrease mass of the object

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