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26 Cards in this Set

  • Front
  • Back
2 Types of Energy Transfer
Particle or Wave
Single bump or disturbance that travels thru a medium
Pulse
<->
Longitudinal (Sound)
^
|
v
Transverse (Electromagnetic)
require a medium
mechanical
high point
crest
low point
trough
max. distance object moves from equilibrium in any periodic motion
amplitude
shortest distance between points where the wave pattern repeats itself
wavelength
velocity of a wave
constant
time it takes the source to return to the same point in its oscillation
period
number of complete oscillations it makes each second
frequency
velocity of sound
343 m/s
velocity of electromagnetic
3x10^8 m/s
part is ___________ part is _________
transmitted; reflected
change in direction of waves at the boundary between 2 different media
refraction
spreading of waves around a barrier
diffraction
result of the superposition of 2 or more waves
interference
how high or low the sound seems
pitch
frequency higher when object moving toward you, then it suddenly drops to a lower pitch as the sound moves away
doppler effect
greater _________, higher the _____
frequency; pitch
What's the difference between a mechanical wave and an electromagnetic wave?
Mechanical wave has to travel thru a medium or particle of some sort
AM radio signals have wavelengths between 200m and 600m. FM signals have wavelengths about 3m. Why is an FM radio station received better in valleys and tunnels?
It bounces up and down more than an AM signal. AM travels straight over mountains.
If the pitch of a sound increases, what are the changes in:
Frequency=?
Wavelength=?
Wave velocity=?
Amplitude=?
Up
Down
Nothing
Nothing
The speed of sound increases when air temperature increases. What happens to the
Frequency=?
Wavelength=?
Nothing
Up
A firecracker produces a sound with intensity 90 dB. How many firecrackers would have to be exploded together to produce a 100 dB sound?
+10dB=2x; 2 firecrackers