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# Cynthia Castro-Waves-Physical Science

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## cynthia castro

on 4 June 2015

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#### Transcript of Cynthia Castro-Waves-Physical Science

Physical Science
Chapter 17
Mechanical Waves
Cynthia Castro
parts of a Longitudinal Waves
what is a longitudinal wave?
In a longitudinal wave, particles of the medium are displaced in a direction parallel to energy transport
Parts of a longitudinal waves
Compression
The area where the particles in a medium are spaced close together
Rarefaction
the area where the particles in a medium are spread out
Amplitude
the amplitude of a wave is the maximum displacement of the medium from its rest position
Period
The period of a wave is the amount of time it takes a particle on a medium to make a complete wave
The frequency of the wave is the number of waves passing a point in a certain time.
the lower the frequency the higher the wavelength
the higher frequency the lover the wavelength
Frequency
what is the relationship between velocity, frequency, and wavelength?
The motion relationship "distance = velocity x time" is the key to the basic wave relationship. With the wavelength as distance, this relationship becomes wavelength = vT. Then using f=1/T gives the standard wave relationship velocity=frequency x wavelength
What is the relationship between wave energy and amplitude?
The energy and the amplitude of a wave are related in a way that the greater the amplitude the greater the energy.
Ex.,) "If a slinky is stretched out in a horizontal direction and a transverse pulse is introduced into the slinky, the first coil is given an initial amount of displacement. The displacement is due to the force applied by the person upon the coil to displace it a given amount from rest. The more energy that the person puts into the pulse, the more work that he/she will do upon the first coil. The more work that is done upon the first coil, the more displacement that is given to it. The more displacement that is given to the first coil, the more amplitude that it will have."
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