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physics ch. 25

QuestionAnswer
what is a vibration? a repeating back and forth motion about an equilibrium position
what is a wave? a disturbance that is transmitted progressively from one place to the next with no actual transport of matter
what are 2 forms of energy that move through space as waves? light and sound
what is a pendulum? weight attached to a string that is free to swing
what is a cycle? one complete back and forth swing
what is a period? time for one cycle
what does the period depend on? length of the pendulum
what does the period not depend on? weight or the size of the swing
what do two pendulums of the same length have? have the same period regardless of the mass
If the pendulum is longer what happens to the period? longer
what does a longer pendulum do? swings back and forth more slowly
what is a simple harmonic motion? back and forth vibrating motion
what is a sine curve? pictorial representation of a wave formed by swinging pendulum or bouncing swing.
what are the high points on a wave called? crests
what are the low points on a wave called? troughs
what is amplitude? the distance from the midpoint to the crest or trough of the wave
what is the maximum displacement from equilibrium? amplitude
what does the amplitude do? 1. Measures the energy of the wave 2. higher wave has more energy 3. lower wave has less energy
what is wavelength of a wave? the distance from the top of one crest to the top of the next one.
what is frequency? number of vibrations in a given time and the number of cycles per second
what is the symbol for frequency? f
What happens if a vibration occurs in one second? the frequency is one cycle per second.
what happens if two vibrations occur in one second? the frequency is two cycles per second
What is the source of all waves? something that vibrates
what is the frequency of the vibration also the frequency for? waves
what is the period of the pendulum inversely proportional to? frequency
what is the inverse of the frequency? period.
what is the symbol for period? T
How is the energy transferred in a wave from a vibrating source to a receiver? carried by a disturbance in a medium
when is there no transfer of matter in a wave from one place to another? when energy is transferred by a wave
what way does matter move? up and down
what does the disturbance move? the energy forward
what is the water, air, and string through which wave energy travels? medium
how is energy not transferred? by matter moving from one place to another withing the medium
what does the speed of a wave depend on? the medium through which the wave moves.
why do wavelength and frequency vary inversely? to produce the same wave speed for all
what do low frequencies have? long wavelength
what do high frequencies have? short wavelength
In transverse waves- where is the motion of the medium compared to the direction of the wave motion? right angle
In longitudinal waves where does the medium move if it is in the same direction in which the wave travels? back and forth
What is another word for a longitudinal wave? a compression wave
what is an example of a compression wave? a sound wave, spring
How is a way that both transverse and longitudinal waves can be demonstrated? a loosely coiled spring
What wave is produced when the end of a coiled spring is shaken up and down? transverse
What wave is produced when a coiled spring is shaken in an out? longitudinal wave is produced
what 2 pieces cannot be in the same place at the same time? matter
what 2 pieces can be in the same place at the same time? waves
An interference pattern is a regular arrangement of places where wave effects are increased, decreased, or neutralize. What is this caused by? overlapping waves
what happens in constructive interference? crest overlaps crest
What is the result of the reinforcement? a wave of increased amplitude
What is destructive interference? crest of one wave overlaps the trough of another
What is the result of cancellation? The result is that the crest of one wave fills in the trough of another.
What kind of amplitude is destructive interference? decreased amplitude
In what interference are the waves out of phase? destructive
In what interference are the waves in phase? constructive
What are some characteristics of interference? all wave motion, whether the waves are water waves, sound waves, or light waves
When can a standing wave form? When an original wave is reflected back after reaching a rigid surface a standing wave can form.
What do the original and reflected waves need to be? the same amplitude and wavelength
What are standing waves a result of? interference
What interference is a node? destructive
what interference is an antinode? constructive
What do different frequencies cause? different standing wave patterns.
What are standing waves found in? strings of musical instruments, organ pipes
where can standing waves be produced? transverse or longitudinal waves
What is the Doppler Effect? change in frequency due to the motion of the source of the waves
what happened if the wave it make is concentric circles? the wave speed is the same in all directions
What happens if a bug bobs in the water at a constant frequency? the wavelength will be the same for all successive waves and the wave frequency is the same as the bug's bobbing frequency.
If two people count the same number of waves per second the source has to be what? stationary
If two people count different numbers of waves per second the source has to be what? moving
If your counting more waves per second why is the frequency higher? the source is moving towards him
If your counting less waves per second why is the frequency lower? source is moving away from him
What also produces the Doppler Effect? sound and light
If a light source is moving towards you does it have a high or low frequency? high
if it is a high frequency what kind of shift is it? blue shift
If a light source is moving away from you does it have a low frequency or high? low
If it is a low frequency what kind of shift does it have? red shift
What is "piled up energy" called? sound barrier
If a plane traveling at the speed of sound causes the pile up of waves what does it make the air like at the front edge? rough
when a plane goes past this "sound barrier" what happens? it is supersonic
What is an airplane flying at the speed of sound? mach 1
What are bow waves? overlapping edges of wave crests produced when the source is moving faster than the wave it makes
What happens when the source moves faster? the V shape becomes narrower
What is a shock wave? overlapping edges of spherical wave crests produced when a source is moving faster than the wave.
What does the cone look like? 3-Dimensional
what is a sonic boom? conical shell of compressed air that sweeps behind a supersonic object reaches the listener's ears
Do all the crests of sound waves reach the listener at once? yes
What does the high air pressure sound like? explosion
What don't we hear from a subsonic craft? sonic boom
When do the crests overlap? Only when the craft moves faster than sound
Does a sonic boom happen once when a plane goes past the sound barrier? no
When the plane is flying what does the cone of air do? keeps behind the plane reaching more listeners on the ground as it flies past
Created by: 16_dnuckolls