Sound Waves - created from Mind Map_3

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PROPERTIES

loudness (amp) - loud and quiet

pitch(frequency) - high and low

quality (wave form/shape) - simple and complex

ALWAYS LONGITUDINAL

made of

compressions

rarefractions

Constructive

high pressure

speakers= pushed out

depression

destructive

low pressure

speakers= pushed in

FUNTIONS

transmit energy through a medium

go thru, around, and reflect off of things

hav constructive and destructive interference

similar to mechanical waves

TUNING FORKS

always vibrate at a specific frequency

OSILISCOPE

PRESSURE/TIME GRAPH

shows how pressure changes over a period of time

Definition

sound made by changes in pressure

SOUND INTENSITY

measure of the amount of sound reaching an area (1m2) in 1 s

exact measurement verses perception(loudness)

pW/m2

sound intensity level - to the power of 10

conversions

measured in the Bel (B)

intensity increases by factor of 10 = increases by 1B

or the decibel (dB)

1B = 10pW/m2

VELOCITY OF SOUND IN AIR

HUMAN HEARING

20 - 20 000 Hz range

dogs - 50 - 50 000 Hz range

infrasonic

ultrasonic

supersonic

subsonic

Sound Waves