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35 Cards in this Set

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Transverse Wave
wave in which the medium is displaced perpendicularly to the direction of wave propagation
Period (T)
T = 1/f
f = frequency
The velocity is only dictated by the nondispersive _______
medium
Two aspects of the medium affecting the velocity:
1) the medium's resistance to change in shape
2) the medium's resistance to change in motion
Why do sound waves travel FASTER in water?
Because the bulk modulus is very high.
For a gas, the velocity increases with ______________
temperature
Surface Waves
-Velocity does not change w/ density
-Velocity increases as depth increases
In deep liquid, a dispersive medium, the velocity increases w/ the _____________
wavelength
Power
Rate at which a wave transfers energy

I(intensity) = (1/2)*d*w^2*A^2*v

d = density of medium
w = angular frequency
What are two factors of medium?
density and velocity
Decibels
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
Beats
occur when two waves with slightly different frequencies are superimposed

f(beat) = abs(f1 - f2)

f1 and f2 = frequencies of original waves
When a wave reflects off a denser medium, the wave is ________
inverted
When a wave reflects off a less dense medium, the wave is ____________
reflected upright
When a wave transfers from one medium to the next, the wavelength __________ and the frequency ____________
changes, remains the same
First Harmonic
-Fundamental Wavelength
-Fewest # of nodes
-Distance from one wall to another = half a wavelength
Equation for double-closed or open standing wave pipe
L = n*(nth wavelength) / 2

n = 1,2,3,etc
Equation for one-sided open/closed standing wave pipe
L = n*(nth wavelength) / 4

n = 1,3,5,etc
Resonant Frequency
v = f*w

f = frequency
w = wavelength
Resonance
Condition where the natural frequency and the driving frequency are equal
Decibels
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
Beats
occur when two waves with slightly different frequencies are superimposed

f(beat) = abs(f1 - f2)

f1 and f2 = frequencies of original waves
When a wave reflects off a denser medium, the wave is ________
inverted
When a wave reflects off a less dense medium, the wave is ____________
reflected upright
When a wave transfers from one medium to the next, the wavelength __________ and the frequency ____________
changes, remains the same
First Harmonic
-Fundamental Wavelength
-Fewest # of nodes
-Distance from one wall to another = half a wavelength
Equation for double-closed or open standing wave pipe
L = n*(nth wavelength) / 2

n = 1,2,3,etc
Equation for one-sided open/closed standing wave pipe
L = n*(nth wavelength) / 4

n = 1,3,5,etc
Resonant Frequency
v = f*w

f = frequency
w = wavelength
Resonance
Condition where the natural frequency and the driving frequency are equal
Period of motion for mass on a spring
T = 2*pi*sqrt(m/k)
Period of motion for a pendulum of length L
T = 2*pi*sqrt(L/g)
Angular Frequency for a mass on a spring:
w = sqrt(k/m)
Angular Frequency for a pendulum:
w = sqrt(g/L)
Doppler Effect
df/fs = v/c

fs = frequency of source