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Physics chapter 25 summary
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Gravity
Terms in this set (47)
Period of a pendulum
Depends on only the length of the pedulum and the acceleration of gravity
Vibration
A repeating back and forth motion about an equilibrium position
Small back and forth motion
A small length of pendulum
The source of all waves
Something that vibrates
Wave
A disturbance that is transmitted progressively from one place to the next
Do waves transport matter
No they transport energy
Simple harmonic motion / oscillatory motion
The back and forth vibrating motion of a pendulum swing
Sine curve
Pictorial representation of a wave
Crest
The high point on a wave
Troughs
The low points on the wave
Amplitude
The distance between he midpoint and the crest of the wave
Wavelength variable
Lambda
Wavelength
The distance between successive identical parts of the wave
Frequency
the number of complete wavelengths that pass a point in a given time
Hertz (Hz)
The unit of frequency
relationship between periods and frequency
Inverse
What is a wave carried by
A disturbance in medium
What do sound waves travel through
Air
Formula for speed of a wave
V=(lambda) x (Frequency)
What does the speed of the wave depend on
The medium in which it travels
What is the relationship between wavelength and frequency
Inverse
What are the two types of waves
Transversal and longitudinal
Transverse wave
When the motion of the medium is at right angles to the direction in which the wave travels
Example of a transverse wave
Radio waves or musical instrument strings vibrating
Longitudinal wave
When the medium oscillate parallel to the direction in which the wave travels
Example of a longitudinal wave
Sound waves
When does interference occur
When waves from different sources arrive at the same place at the same time
Interference pattern
Arrangement of places where wave effects are increased, decreased, or neutralized
Constructive interference
The crest of one wave overlaps the crest of another and their individual effects are added together
What is the result of constructive interference
Increase in amplitude
destructive interference
The crest of one wave overlaps the trough of another and their individual effects are reduced
Destructive interference is also called
Cancelation
In phase
The crest and troughs of two waves overlap
Out of phase
The crest of one wave overlaps the trough of another which creates regions of zero amplitude
Interference effects..
All waves in motion
How do standing waves form
When half a wavelength or a multiple of half a wavelength fit exactly into the length of the vibrating medium
What is a standing wave
A wave that appears to stay in one place
Node
The stationary point on a standing wave
Antinode
The positions on a standing wave that have the largest amplitude
Standing waves are the result of
Interference
Standing waves can form on what types of waves
Transversal and longitudinal
What is the Doppler effect
When either the wave source or the observer is moving and this results in what appears to be changes in frequency
The Doppler effect occurs for what types of waves
Light and sound
Blue shift
Increase in frequency in light
Red shift
Decrease in frequency of light
What is a bow wave
When the wave source moves faster that the wave it produces
What is a shock wave
Occurs when an object move faster than the speed of sound
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