Physics 6 Waves
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Define: Wave and types
 Wave: transfer of momentum and energy from one point to another
 Types: Mechanical, Electromagnetic, and matter

What are two types of mechanical waves?
Transverse and longitudinal

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)

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

Equation for velocity of a wave.

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

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, 1010000 is 30 decibels

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

Describe simple harmonic motion
Any motion that is repetitious and resembles a sine wave as a function of time

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.

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.

equation for Decibels
B=10logI/I(not)

Give equation for nodes of standing wave
 L=[n(lambda_{n})]/4 (n=odd positive integers)
 L=[n(lmabda_{n})]/2 (n= all positive integers)

what is the equation for beat frequency
f_{b}=f_{1 } f_{2}

Doppler effect equations
 [(delta)f/f_{s}] = v/c
 [(delta)(lambda)/(lambda_{s}) = v/c