# Shared Flashcard Set

## Details

Physics-Waves and Sound
Topics and Equations for MCAT
23
Physics
06/28/2020

Term
 Transverse Waves
Definition
 Particle oscillation is perpendicular to wave propagation ex. Light waves
Term
 Longitudinal Waves
Definition
 Particle oscillation is parallel to the wave propagation ex. Sound waves
Term
 Velocity of Wave
Definition
 v=fλ
Term
 Period of Wave
Definition
 T=1/f
Term
 Principle of Superposition
Definition
 When two waves interact it causes the resultant wave to have an amplitude equal to the sum of the 2 waves
Term
 Constructive Interference
Definition
 When 2 waves are perfectly in phase (0o or 360o) the resulting amplitude is 2x the amplitude of the waves
Term
 Destructive Interference
Definition
 When 2 waves are perfectly in phase (180o) the resulting amplitude is zero since the amplitude of the waves will cancel each other out
Term
 How does sound waves change as they pass through different mediums?
Definition
 Sound travels fastest through a solid and slowest through a gas
Term
 Doppler Effect Equation
Definition
 fo=fs(v±vov∓vs)   f=fo(v±vdv∓vs)   :where fo is the emitted frequency
Term
 Sign Convention of Doppler Effect Equation
Definition
 If object is moving away from the other object: Use bottom sign If object is moving towards other object: Use top sign
Term
 Intensity Equation
Definition
 I=P/A
Term
 Sound Level Equation
Definition
 Β=10 log(I/Io) :where Io is the threshold of hearing with a value of 1e-12 W/m2(dB)
Term
 Change in Sound Level Equation
Definition
 Βf=Βi+log(If/Ii)
Term
 Length of Standing Waves: Strings
Definition
 L=n(λ/2): where n is the harmonic number (#of antinodes/half-wavelengths)
Term
 Wavelength of Standing Waves: Strings
Definition
Term
 Wavelength of Standing Waves: Strings
Definition
 λ=2L/n :where n is the harmonic number (# of antinodes/half-wavelengths)
Term
 Frequency of Standing Waves: Strings
Definition
 f=nv/2L :where n is the harmonic number (# of antinodes/half-wavelengths)
Term
 Length of Standing Waves: Open Pipes
Definition
 L=n(λ/2) :where n is the harmonic number (# of nodes/half-wavelengths)
Term
 Wavelength of Standing Waves: Open Pipes
Definition
 λ=2L/n :where n is the harmonic number (# of nodes/half-wavelengths)
Term
 Frequency of Standing Waves: Open Pipes
Definition
 f=nv/2L :where n is the harmonic number (# of nodes/half-wavelengths)
Term
 Length of Standing Waves: Closed Pipes
Definition
 L=n(λ/4) :where n is the harmonic number and can only be odd number
Term
 Wavelength of Standing Waves: Closed Pipes
Definition
 λ=4L/n :where n is the harmonic number that can only be odd numbers
Term
 Frequency of Standing Waves: Closed Pipes
Definition
 f=nv/4L :where n is the harmonic number that can only be odd numbers
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