Physics 6 Waves

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1. Define: Wave and types
• Wave: transfer of momentum and energy from one point to another
• Types: Mechanical, Electromagnetic, and matter
2. What are two types of mechanical waves?
Transverse and longitudinal
3. Define: wavelength, Frequency, period, and amplitude. Give units
• wavelength (lambda): distance between two identical (repeated) points in a wave (meters)
• Frequency (f): the amount of waves that pass a point in space in 1 sec (m/s=Hz)
• Period (T): recipricol of frequency - time/wavelength
• Amplitude (A): Maximum displacement from 0 (always positive)
4. What are the two big rules for waves?
• 1: the speed of a wave is determined by the medium and type of wave.  NOT frequency.  Frequency is inversely propoprtional to wavelength in any given medium
• 2:When a wave transfers between mediums, the velocity changes, but the frequency does not
5. Equation for velocity of a wave.
• v=fV
• f=frequency
6. 2 aspects of media that affect the velocity of a wave
• 1: elasticity/resistance to change in shape
• 2:inertia/resistance to change in motion
7. how do decibels work?
They are a logrithmic representation of sound intensity that create an intuitive scale.

every factor of 10 change in intensity is equivilent to an addition/subraction of 10 decibels.  300 to 3000 is 10 decibels, 10-10000 is 30 decibels
8. define:phase, constructive and destructive interference
• phase: is kind of an address for a wave.  It describes its wavelength, frequency, and place in time against its origin.
• constructive: when 2 or more waves superimpose and the sum of their displacements are larger
• deconstructive: when 2 or more waves superimpose and the sum of their displacements are smaller
9. Describe simple harmonic motion
Any motion that is repetitious and resembles a sine wave as a function of time
10. 3 properties to be aware of in simple harmonic motion
• 1: Acceleration is directly proportional to displacement, but opposite in sign.
• 2: Acceleration and displacement are related byu the square of the frequency
• 3: energy of a system in simple harmonic motion oscillates between kinetic and potential energy.
11. Define: doppler effect
because sound waves move at speeds independently of the speed of what created them, the frequency of the wave experienced by a stationary observer changes with the distance it travels and is therefore experienced differently although it is the same wave.
12. equation for Decibels
B=10logI/I(not)
13. Give equation for nodes of standing wave
• L=[n(lambdan)]/4 (n=odd positive integers)
• L=[n(lmabdan)]/2 (n= all positive integers)
14. what is the equation for beat frequency
fb=|f- f2|
15. Doppler effect equations
• [(delta)f/fs] = v/c
• [(delta)(lambda)/(lambdas) = v/c
 Author: p.reilly1227 ID: 233855 Card Set: Physics 6 Waves Updated: 2013-09-09 22:06:59 Tags: Physics waves Folders: Description: Physics 6 waves Show Answers: