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33 Cards in this Set
- Front
- Back
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Vibration |
Periodic wiggle in time |
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Wave |
A periodic wiggle in space AND time |
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A wave... |
extends from one place to another |
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A simple Pendulum: |
Depends only on the length of the pendulum DOES NOT depend on the mass |
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Period: (T) |
Time for one complete vibration or cycle Measured in seconds/vibration OR seconds/cycle |
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Frequency: (f) |
Vibrations per time Measured in vibrations/second OR cycles/second |
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1 cycle/second = |
1 Hz (Hertz) |
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Period: |
T= 1/f |
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Frequency:
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f=1/T
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Sound has a frequency of... |
a few 100 or 1000 Hz |
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Radio waves have frequencies of... |
a few million Hz |
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Mechanical Objects have frequencies of... |
a few Hz
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Cell phones operate at.... |
a few billion Hz |
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What is the period of the hand on a clock that measures the seconds? |
60 seconds |
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Wave description |
A wave is drawn as a sine curve |
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Sine curve |
obtained when you trace out the path of a vibrating pendulum over time. |
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Crests: |
High points of the wave |
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Troughs: |
Low points of the wave
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Amplitude: |
From the top of a crest to the middle |
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Wavelength: |
From one crest to the next crest |
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What is the frequency of an object bouncing up and down on a string? |
the number of times it reaches its highest point in a given amount of time. |
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wave speed= frequency x wavelength |
v = f x > |
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Transverse waves: |
perpendicular to motion Ex: water waves and light waves |
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Longitudinal waves: |
Parallel to motion Ex: Sound and slinky |
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Waves transport... |
ENERGY (not matter) |
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Sound waves.. |
travel through walls |
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Light waves.. |
travel though empty space |
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Interference: |
Reinforcement and Cancellation |
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Node: |
Null point in between two waves or when a rope is standing still |
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Incident wave: |
The one being created |
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Reflected wave: |
The one being reflected back |
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Doppler Effect: |
Ex: bug moving across water |
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Tacoma Narrows Bridge: |
WENT CRAZY |
