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35 Cards in this Set
- Front
- Back
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Transverse Wave
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wave in which the medium is displaced perpendicularly to the direction of wave propagation
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Period (T)
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T = 1/f
f = frequency |
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The velocity is only dictated by the nondispersive _______
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medium
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Two aspects of the medium affecting the velocity:
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1) the medium's resistance to change in shape
2) the medium's resistance to change in motion |
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Why do sound waves travel FASTER in water?
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Because the bulk modulus is very high.
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For a gas, the velocity increases with ______________
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temperature
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Surface Waves
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-Velocity does not change w/ density
-Velocity increases as depth increases |
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In deep liquid, a dispersive medium, the velocity increases w/ the _____________
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wavelength
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Power
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Rate at which a wave transfers energy
I(intensity) = (1/2)*d*w^2*A^2*v d = density of medium w = angular frequency |
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What are two factors of medium?
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density and velocity
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Decibels
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B = 10*log(I/Io)
Io = threshold intensity B = intensity level If intensity increases by factor of 10, decibels increase by 10, if I increases by 100, dB increases by 20, etc |
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Beats
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occur when two waves with slightly different frequencies are superimposed
f(beat) = abs(f1 - f2) f1 and f2 = frequencies of original waves |
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When a wave reflects off a denser medium, the wave is ________
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inverted
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When a wave reflects off a less dense medium, the wave is ____________
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reflected upright
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When a wave transfers from one medium to the next, the wavelength __________ and the frequency ____________
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changes, remains the same
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First Harmonic
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-Fundamental Wavelength
-Fewest # of nodes -Distance from one wall to another = half a wavelength |
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Equation for double-closed or open standing wave pipe
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L = n*(nth wavelength) / 2
n = 1,2,3,etc |
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Equation for one-sided open/closed standing wave pipe
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L = n*(nth wavelength) / 4
n = 1,3,5,etc |
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Resonant Frequency
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v = f*w
f = frequency w = wavelength |
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Resonance
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Condition where the natural frequency and the driving frequency are equal
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Decibels
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B = 10*log(I/Io)
Io = threshold intensity B = intensity level If intensity increases by factor of 10, decibels increase by 10, if I increases by 100, dB increases by 20, etc |
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Beats
|
occur when two waves with slightly different frequencies are superimposed
f(beat) = abs(f1 - f2) f1 and f2 = frequencies of original waves |
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When a wave reflects off a denser medium, the wave is ________
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inverted
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When a wave reflects off a less dense medium, the wave is ____________
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reflected upright
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When a wave transfers from one medium to the next, the wavelength __________ and the frequency ____________
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changes, remains the same
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First Harmonic
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-Fundamental Wavelength
-Fewest # of nodes -Distance from one wall to another = half a wavelength |
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Equation for double-closed or open standing wave pipe
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L = n*(nth wavelength) / 2
n = 1,2,3,etc |
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Equation for one-sided open/closed standing wave pipe
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L = n*(nth wavelength) / 4
n = 1,3,5,etc |
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Resonant Frequency
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v = f*w
f = frequency w = wavelength |
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Resonance
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Condition where the natural frequency and the driving frequency are equal
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Period of motion for mass on a spring
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T = 2*pi*sqrt(m/k)
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Period of motion for a pendulum of length L
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T = 2*pi*sqrt(L/g)
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Angular Frequency for a mass on a spring:
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w = sqrt(k/m)
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Angular Frequency for a pendulum:
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w = sqrt(g/L)
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Doppler Effect
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df/fs = v/c
fs = frequency of source |
