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33 Cards in this Set

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Vibration

Periodic wiggle in time

Wave

A periodic wiggle in space AND time

A wave...

extends from one place to another

A simple Pendulum:

Depends only on the length of the pendulum


DOES NOT depend on the mass

Period: (T)

Time for one complete vibration or cycle




Measured in seconds/vibration OR seconds/cycle

Frequency: (f)

Vibrations per time




Measured in vibrations/second OR cycles/second



1 cycle/second =

1 Hz (Hertz)

Period:

T= 1/f

Frequency:

f=1/T

Sound has a frequency of...

a few 100 or 1000 Hz

Radio waves have frequencies of...

a few million Hz



Mechanical Objects have frequencies of...

a few Hz



Cell phones operate at....

a few billion Hz

What is the period of the hand on a clock that measures the seconds?

60 seconds

Wave description

A wave is drawn as a sine curve

Sine curve

obtained when you trace out the path of a vibrating pendulum over time.

Crests:

High points of the wave

Troughs:

Low points of the wave

Amplitude:

From the top of a crest to the middle

Wavelength:

From one crest to the next crest

What is the frequency of an object bouncing up and down on a string?

the number of times it reaches its highest point in a given amount of time.

wave speed= frequency x wavelength

v = f x >

Transverse waves:

perpendicular to motion




Ex: water waves and light waves

Longitudinal waves:

Parallel to motion




Ex: Sound and slinky

Waves transport...

ENERGY (not matter)

Sound waves..

travel through walls

Light waves..

travel though empty space

Interference:

Reinforcement and Cancellation

Node:

Null point in between two waves or when a rope is standing still

Incident wave:

The one being created

Reflected wave:

The one being reflected back

Doppler Effect:

Ex: bug moving across water

Tacoma Narrows Bridge:

WENT CRAZY