Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
EK Physics 6
waves
| Question | Answer |
|---|---|
| wave | transfer of momentum & energy from 1 pt to another |
| three types of waves | mechanical, electromagnetic, and matter |
| mechanical waves | obey laws of classical physics and require medium to travel, separated into transverse and longitudinal waves |
| transverse wave | one which medium is displaced perpendicularly to the direction of wave propagation |
| longitudinal wave | one which medium is displaced parallel to the direction of wave propagation, ex: sound wave |
| wavelength | x-axis displacement of wave, from any point to the next point it repeats itself |
| frequency | # of wavelengths that pass thru fixed point in one second, measured in Hz |
| velocity relates to frequency and wavelength by which eqn? | v = f*wavelength |
| period | reciprocal of frequency = the number of seconds required for 1 wavelength to pass thru a fixed point |
| amplitude | A, maximum displacement from zero, always positive |
| transverse and longitudinal waves represented mathmetically with.. | sine functions |
| for a gas, velocity increases or decreases with temperature | increases - the greater th temperature, the greater the random velocity and the greater the sound wave velocity |
| two aspects of medium affect velocity | 1. medium's resistence to change in shape or elasticity and 2. the medium's resistance to change in motion or inertia |
| do sound waves move more quickly through hot or cold gases? | hot gases - velocity is limited by the average speed of molecules within that gas |
| wave intensity increases with... | the square of the amplitude and square of frequency for all waves |
| power of wave | rate at which wave transfers energy, expressed in intensity |
| intensity level | (B) = 10log(I/Io) given in dB's |
| phase of a wave | relates to its wavelength, freq, and place and time of origin = kx-omega*t ** horizontal shift of a wave on a graph |
| constructive interference | occurs when the sum of the displacements results in a greater displacement |
| destructive interference | occurs when the sum of the displacements results in a smaller displacement |
| beat | occurs when 2 waves with slightly different f are superimposed where at some points will have constructive/destructive interference -*alternating increase and decrease in the intensity of noise |
| beat frequency eqn | fbeat = f1 - f2 |
| pitch | what is actually heard from the beat, average of the frequencies of the two frequencies, high notes - high pitch, and high frequency |
| when a wave transfers from one medium to the next, the wavelength ____ and the frequency ____. | wavelength changes and frequency remains the same |
| node | point in wave with zero displacement |
| antinode | point of maximum constructive interference |
| standing wave | condition where string holds perfectly still at nodes and moves violently up and down at the antinodes |
| first harmonic | aka fundamental wavelength, longest wavelength and created w/ the fewest # of nodes - two |
| second harmonic | one more node than the first harmonic |
| harmonic series where each end is tied down as a node or both ends are antinode | L = n*wavelength/2 where n (=1,2,3..) is the number of harmonic and L is the distance btw the two ends of the strong |
| harmonic series for string tied only at one end | L = n*wavelength/4 (n =1,3,5..) |
| resonant frequency | natural frequency |
| period for mass on a spring | T = 2*pi*sqrt(m/k) |
| period for pendulum | T = 2*pi*sqrt(L/g) |
| doppler effect | if source moves relative to receiver of the waves, each wave will travel a diff distance in order to reach the observer so it won't reach observer at the same frequency |
| when relative velocity brings source and observer closer... | observed frequency goes up and observed wavelength goes down |
| when the relative velocity brings source and observer further away | observed frequency goes down and observed wavelength goes up |
| doppler effect eqn | change in f / source f = v / c = change wavelength / source wavelength where v = velocity of source and c = velocity of wave |
| wave intensity is proportional to... | its energy |
Created by:
miniangel918
Popular MCAT sets