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35 Cards in this Set
 Front
 Back
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 doubleclosed or open standing wave pipe

L = n*(nth wavelength) / 2
n = 1,2,3,etc 

Equation for onesided 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 doubleclosed or open standing wave pipe

L = n*(nth wavelength) / 2
n = 1,2,3,etc 

Equation for onesided 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 