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29 Cards in this Set
- Front
- Back
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What is a wiggle in time called?
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A vibration
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What is the source of all waves?
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something that is vibrating
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distinguish between sound waves and light waves
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Sound is the propogation of vibrations through a material medium, while
Light is a vibration of nonmaterial electric and magnetic fields, it can progpogate through a vacuum while sound needs material |
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A wiggle in space and time?
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A wave
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What feature about a pendulum makes it useful in a grandfather clock?
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It's regularity
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What is the period of a pendulum?
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The time of a to and fro swing
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If a pendulum takes one second to make a comlete to and fro swing, how great is its period?
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one vibration per second
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The period of a certain pendulum is 2 s, and the period another is 1 s. which pendulum is longer?
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The pendulum with a longer period which is the 2 s pendulum
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How is a sine curve related to a wave?
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It is a pictoral representation of a wave.
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Distinguish between these different parts of a wave: amplitude, wavelength, frequency, and period
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amplitude: the distance from the midpoint to the crest of the wave
wavelength:the distance from the top of one crest to the top of another frequency: the number of two and fro vibrations in a given time period: the time of a to and fro swing |
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How many vibrations per second are represented in a radio wave of 101.7 MHz?
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101,700,000 hertz
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How do frequency and period relate to each other?
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frequency = 1/period
while Period = 1/frequency so they are inversly related |
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Exactly what is it that moves from source to receiver in wave motion?
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energy
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Does the medium in which a wave moves travel along with the wave itself? Give examples to support your answer
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No, in the case of a rope tied to a wall if the rope is disturbed the wave passes through but the rope returns to its initial position, if material followed the wave then the rope would not end up in the same place once the wave has left.
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What is the relationship among frequency, wavelength, and wave speed?
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wave speed = wavelength X frequency
since period is equal to the inverse of frequency, the formula wave speed = wavelength/ period |
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As the frequency of a wave of constant speed is increased, does the wavelength increase or decrease?
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The wavelength decreases
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hz=
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cycles per second
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speed of light
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3 X 10^8 meter/sec
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In a transverse wave, in which direction do the vibrations move when compared with the direction of wave travel?
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right angled or sideways
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In a longitudinal wave, in which direction do the vibrations move when compared with the direction of wave travel?
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transverse to the direction of the waves.
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How do compressions and rarefactions of longitudinal waves compare to crests and troughs of transverse waves?
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Both compressions and rarefactions travel in the same direction along the slinky. Sound waves are longitudinal waves.
Both waves transfer energy from left to right. When the end of the slinky is is pushed and pulled forward and back a longitudinal wave is produced, When it's shaken up and down a transverse wave is produced. The longitudinal wave vibrates parallel to the direction of energy transfer between successive compressions is a stretched region, called a rarefaction. |
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Distinguish between constructive interference and destructive interference
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In constructive interference, when the crest of one wave overlaps the crest of another, their individual effects add together to produce a wave of increased amplitude. When the crest of one wave overlaps the trough of another, their individual effects are reduced. The high part of one wave simply fills in the low part of another.
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What does it mean to say one wave is out of phase with another?
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We can see the regions where the crest of one wave overlaps the trough of another to produce regions of zero amplitude. At points along these regions, the waves arrive out of step, or out of phase.
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What kinds of waves can show interference?
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Interferene is characteristic of all wave motion, whether the waves are water waves, sound waves, or light waves
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What causes a standing wave?
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When waves reflect back and the incident and reflected waves interfere to produce a standing wave
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What is a node?
What is an antinode? |
Nodes are the stationary part of the wave, they are regions of minimal or zero energy, whereas antinodes are regions of maximum displacement and maximum energy
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In the doppler effect, does frequency change when the source moves? Does wavelength change? Does wave speed change?
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Yes, the change in frequency is due to the motion of the source , Depending on where you are observing the wavelength will either decrease or increase, same goes for the wave speed.
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Can the doppler effect be observed with longitudinal waves, transverse waves, or both?
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both
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What is meant by a blue shift and a red shift for light?
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When a light source approaches, there is an increase in its measured frequency; when it recedes, there is a decrease in its frequency. An increase in frequency is called a blue shift, because the increase is toward the high frequency, or blu, end of the color spectrum. A decrease in frequency is called a red shift, reffering to a shift toward the lower-frequency, or red, end of the color spectrum.
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