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# Waves

Waves transmit _____________. energy
Waves do not transmit ____________. matter
vacuum Empty space
These waves can transmit energy through a vacuum. Electromagnetic waves
These waves can NOT transmit energy through a vacuum. Mechanical waves
In transverse waves, particles of the medium move in a direction ______________ to the direction of the wave. perpendicular
In a longitudinal wave, particles of the medium move in a direction _____________ to the direction the wave moves. parallel
Another name for a longitudinal wave Compression wave
In a surface wave, the particles of the medium move in a __________motion. circular
amplitude the measure of wave energy; the distance from the resting position to the highest or lowest points
energy of the wave varies in _______________ to the amplitude of the wave direct proportion
The _________ the amplitude, the _________ the energy. higher; greater
wavelength of a transverse wave distance between crests and troughs of two consecutive transverse waves
crest Highest parts of a transverse wave
troughs Lowest parts of a transverse wave
Wavelength of a longitudinal wave Distance between compressions and rarefactions
compression Most tightly packed area of a longitudinal wave
rarefaction Most spread out area of a longitudinal wave
frequency Number of wavelengths that pass a point in a given amount of time
How are wavelength and frequency related? Inversely proportional
The frequency of a wave _____________ as its wavelength ______________ OR it __________ as its wavelength __________. Increases; decreases OR Decreases; increases
Shorter wavelength = _____ frequency = _____ energy Higher; more
Longer wavelength = ______ frequency = _____ energy Lower; less
Hertz (Hz) Unit of measurement for frequency; one Hertz = one wave per second
pitch The highness or lowness of a sound
Doppler Effect If you are standing still and a car drives past you, the frequency of the sound will change as the car passes you. The sound pitch will be higher as the car is coming towards you and then lower as the car moves away. Its frequency is the same.
Doppler Effect pt. 2 However, as the car is traveling towards you the speed of the car is causing the sound waves to hit your ear faster or at a higher frequency than the car is making them.

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