Hearing and Sound Flashcards
What is a decibel?
a logarithmic scale used to describe ratios with a large range of values
When sound is generated, energy is spread _____.
spherically in all directions
Sound _____ through a medium.
propagates
A “just noticeable” change in sound pressure level, either louder or softer, requires a _____ change.
+/-3 dB
The equation which correctly states the difference in decibels for two voltages or distances is _____.
20 times the logarithm of the ratio of the two numbers being compared
Harmonics are _____.
the whole number multiples of a fundamental frequency
The “audio” portion of “audiovisual” refers to _____.
sound
Wavelength is the _____.
Physical distance between two points of a waveform that are exactly one cycle apart.
The equation which correctly states the difference in decibels for two power values is _____.
10 times the logarithm of the ratio of the two numbers being compared
Because air is a(n) _____ medium, vibrated molecules transmit motion to the molecules surrounding them.
elastic
A logarithm can be defined as the _____.
number of times the numeral 10 must be multiplied by itself to get a certain value
Through the Inverse Square Law, the spread of energy that is propagated can be followed _____.
spherically and horizontally
Complex waveforms can be broken down into _____.
individual sine waves
Which sequence of numbers depicts part of a logarithmic scale?
1, 10, 100, 1000
An octave is _____.
a doubling of frequency
