Acoustics

Card Set Information

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

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