Waves and Oscillations
Repeating Motion
Oscillations
An oscillation is a motion that repeats around an equilibrium point. A classic example is a mass on a spring.
Waves
A wave is a disturbance that carries energy and information through space and time. Common wave quantities include wavelength , frequency , and speed .
Wave relation
These quantities are related by . If frequency goes up while speed stays the same, wavelength goes down.
Resonance
Resonance happens when a system is driven near one of its natural frequencies, causing larger oscillations.
What is the relation between wave speed, frequency, and wavelength?
Wave speed equals frequency times wavelength.
Correct answer:
What is resonance?
Resonance occurs when driving matches the system's preferred oscillation rate.
Correct answer: A large response when a system is driven near its natural frequency.
Describing a wave
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1
Identify the oscillating quantity.
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2
Measure its amplitude.
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3
Find the frequency or period.
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4
Measure wavelength if the disturbance travels.
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5
Use to connect them.
If frequency doubles and wave speed stays constant, what happens to wavelength?
From , if is fixed and doubles, must halve.
Correct answer: It halves