Acoustics
Card Set Information
Author:
amyg
ID:
135793
Filename:
Acoustics
Updated:
2012-02-16 13:25:10
Tags:
Test
Folders:
Description:
Test 1
Show Answers:
To vibrate, a source must have 2 sounds, they are?
Mass and Elasticity
A medium must have two properties, they are?
Mass and elasticity
Sound needs...
A source to generate, and environment to travel, an applied force
T/F. Weight has gravity, mass doesnt.
True
One cycle is..
Equilibrium--> max disp. one way-->equilibrium-->max disp. another way-->equilibrium
T/F Inertia and mass are directly proportional
True. One goes up other goes up
Particles move about positions of equilibrium because of two opposing forces, they are?
Inertia and elasticity
Three Fundamental Physical Quantities are?
Length, mass and time
Vector quantity has....
Both magnitude and direction
Scalar quantity has...
only magnitude
T/F. Velocity can change without acceleration.
FALSE. It cannot.
T/F. Compliance and stiffness are indirectly proportional.
True.
Sustained vibratory motionhas two opposing forces, they are?
Inertia and gravity
KE is transformed to thermal energy because of..
Friction
Speed of sound for air?
About 330 m/s
T/F. A sine wave has more than one frequency.
False. It only has one
Five dimensions of the sine wave?
Amplitude, Frequency, Period, Phase, Wavelength
Total Impedance has 2 components, they are?
Resistance (R)- friction, use up energy
Reactance (X)- storage of energy
The Watt is..
Energy transferred per unit time
To convert from bels to decibels multiply by...
10
For every 10 fold chance in Ix, dB changes by?
10 dB
For every 2 fold change in Ix, dB changes by?
3dB