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52 Cards in this Set
- Front
- Back
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speed of all EM waves |
3.0 x 10^8
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3 types of mechanical waves
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transverse, longitudinal, torsion
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mechanical waves...
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require a medium
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free end reflection
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wave reflected on the same side
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when two waves meet from opposite sides
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they cancel out
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Universal Wave Equation
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velocity= fλ |
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when 2 waves meet on the same side
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they double in amplitude
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period
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time over number of cycles
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frequency
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= number of cycles over time
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crest
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occurs when an object vibrates perpendicularly to its axis
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nodal point
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point of destructive interference that remains at rest
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rarefraction
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region in a LONGITUDINAL wave where particles = farther apart than normal
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Fixed-end reflection
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reflected pulse = inverted
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cycle
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1 complete back & forth motion/oscillation/vibration
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loop
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crest meets crest
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giga
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10^9
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mega
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10^6
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kilo
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10^3
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centi
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10^-2
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milli
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10^-3
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micro
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10^-6
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nano
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10^-9
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period
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time over cycle
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frequency
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# of cycles over time or 1 over period
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Transverse Waves
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particles vibrate perpendicular to the direction of wave motion
mechanical |
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wave motion
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-----> or <--------
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particle motion
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^
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longitudinal waves
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particles vibrate parallel to the direction of wave motion
mechanical |
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torsion waves
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twisting motion (bridge)
mechanical |
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phase
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position of crest or trough at any part of the wave at any time
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relative of phase
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relationship of 2 waves
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difference of waves
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difference of 2 waves
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CONSTRUCTIVE Interference
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2 waves join together and the sum of their amps= amplitude of new wave
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DESTRUCTIVE Interference
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trough of one wave @ same time as a crest of another... waves cancel out
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Principle of Superposition
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2 waves @ 1 place; amp= sum of amps
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sound waves
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LONGITUDINAL
motion of air particles= parallel to direction of sound travels faster in solids/liquids high pitch= high f loud noise= large amp |
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Universal Wave Equation
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v=
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332m/s + 0.59 (T°C)
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wavelength
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crest to crest or trough to trough
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f(beats)=
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| f2 - f1 |
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Doppler Effect
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Doppler Effect Equation
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v of sound
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340m/s
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All oscillating objects have a... |
natural frequency which they will vibrate @. |
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Resonance |
Vibration caused when a periodic force is applied at the same frequency as the natural frequency
Ex: Child on a swing, trampoline |
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Resonance in strings + springs |
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Open Air Columns |
Starts at L=1/2 (λ), increases by 1/2 |
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Closed Air Columns |
Starts at L=1/4(λ), increases by 2/4 |
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Frequency vs. Tension Equation |
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Frequency vs. Length Equation |
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Frequency vs. Diameter Equation |
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Frequency vs. Diameter Equation |
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