Chapter 13 Test
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Sound can be defined as the form of _____ detectable by our ____.
Energy and Ears
Define Compression
Highest Point of sound wave. Point of High Particle Density
Define Refraction
Lowest Point of sound wave. Trough of the sound wave.
T or F: Tuning forks once tapped can make ripples in a tank of Water
True
In the 1700’s who was the first man to accurately measure the speed of sound through air?
Robert Boyle
Derham’s Experiments eventually indicated that the speed of _____ is dependent on the _____ of air
Sound and Density
In general, the _____ the medium, the ______ the sound travels.
Stiffer and faster
T or F: The speed of sound in the air is higher on a hot summer’s day that a cold winter’s day
True
Musical _________ and other objects produce _____ sounds
Instruments and Distinct
What are frequencies called that are below human hearing?
Infrasonic
What are frequencies called that are above human hearing?
Ultrasonic
Define Pitch
the quality of a sound governed by the rate of vibrations producing it
In what unit is frequency measured?
Hertz (Hz)
As a person grows _____, he typically loses the ability to hear ______ frequencies
Older and Higher
Define Intensity
A Measure of the Power contained in an acoustic wave. The rate as which it transmits energy
What does TOH stand for and define it
“Threshold of Hearing”. The softest sound detectable by the average person’s ears
The particular sound of an instrument is its _______
Quality
Define acoustics
the properties or qualities of a room or building that determine how sound is transmitted in it.
When architects construct auditoriums, they try to minimize _____________ which are multiple __________ of a sound formed when it ________ off distant surfaces
Reverberations, Echoes, and Reflects.
T or F: Porous materials reflect sound
False
T or F: Hard Surfaces absorb sound well
False
Items that absorb sound
Acoustic Tiles
Resonance is when objects have a frequency at which they _________ vibrate
Naturally
In sound waves, ______ are heard when two musical instruments are not quite tuned together
Beats