Physics 6 Waves

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p.reilly1227
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233855
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Physics 6 Waves
Updated:
2013-09-09 18:06:59
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Physics waves
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Physics 6 waves
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  1. Define: Wave and types
    • Wave: transfer of momentum and energy from one point to another
    • Types: Mechanical, Electromagnetic, and matter
  2. What are two types of mechanical waves?
    Transverse and longitudinal
  3. Define: wavelength, Frequency, period, and amplitude. Give units
    • wavelength (lambda): distance between two identical (repeated) points in a wave (meters)
    • Frequency (f): the amount of waves that pass a point in space in 1 sec (m/s=Hz)
    • Period (T): recipricol of frequency - time/wavelength
    • Amplitude (A): Maximum displacement from 0 (always positive)
  4. What are the two big rules for waves?
    • 1: the speed of a wave is determined by the medium and type of wave.  NOT frequency.  Frequency is inversely propoprtional to wavelength in any given medium
    • 2:When a wave transfers between mediums, the velocity changes, but the frequency does not
  5. Equation for velocity of a wave.
    • v=fV
    • f=frequency
  6. 2 aspects of media that affect the velocity of a wave
    • 1: elasticity/resistance to change in shape
    • 2:inertia/resistance to change in motion
  7. how do decibels work?
    They are a logrithmic representation of sound intensity that create an intuitive scale.

    every factor of 10 change in intensity is equivilent to an addition/subraction of 10 decibels.  300 to 3000 is 10 decibels, 10-10000 is 30 decibels
  8. define:phase, constructive and destructive interference
    • phase: is kind of an address for a wave.  It describes its wavelength, frequency, and place in time against its origin.
    • constructive: when 2 or more waves superimpose and the sum of their displacements are larger
    • deconstructive: when 2 or more waves superimpose and the sum of their displacements are smaller
  9. Describe simple harmonic motion
    Any motion that is repetitious and resembles a sine wave as a function of time
  10. 3 properties to be aware of in simple harmonic motion
    • 1: Acceleration is directly proportional to displacement, but opposite in sign.
    • 2: Acceleration and displacement are related byu the square of the frequency
    • 3: energy of a system in simple harmonic motion oscillates between kinetic and potential energy.
  11. Define: doppler effect
    because sound waves move at speeds independently of the speed of what created them, the frequency of the wave experienced by a stationary observer changes with the distance it travels and is therefore experienced differently although it is the same wave.
  12. equation for Decibels
    B=10logI/I(not)
  13. Give equation for nodes of standing wave
    • L=[n(lambdan)]/4 (n=odd positive integers)
    • L=[n(lmabdan)]/2 (n= all positive integers)
  14. what is the equation for beat frequency
    fb=|f- f2|
  15. Doppler effect equations
    • [(delta)f/fs] = v/c
    • [(delta)(lambda)/(lambdas) = v/c

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