# Unit 12: Physics.

### 47 terms by MayaNicole

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reverberations

### "Dead spots" in an auditorium are the results of

destructive interference

octave

length

harmonics

fifth

Music

fundamental

overtones

beats

second

noise

quality

refraction

tension

resonance

mass

### Speed of sound in air equation ?

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

V=2d/t

V=FY

I=P/A

### Sound waves are ______, ______ waves

mechanical , longitudinal

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

compressions and rarefractions

medium

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

slower, less

vacuum

solids

gases

faster

### The ____ range of freq for the avg human is ___

audible, 20-20,000

ultrasonic

infrasonic

dB, intensity

power, areas

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

Beats

### echoes are ___ sound waves, and ___ are multiple echoes

reflected, reverberation

Mach

supersonic

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

Example: