# lect548 - Review Chapters Covered 15,16,20 Vibrations and...

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Review

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Chapters Covered: 15,16,20
Vibrations and Waves

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The Period of Oscillations
m k f k m T / 2 1 / 2 π = =

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Important : The period of simple oscillations doesn’t depend on the amplitude!!
The Simple Pendulum

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g L T / 2 π = The period doesn’t depend on the mass of bob, it depends only on the length of the thread.
Forced Vibrations; Resonance

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The increase of amplitude near f=f 0 is known as resonance.
At what frequencies (if any) except for f 0 might be observed a resonance?

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1. You stand to the side of the low point of a child’s swing and always push the child in the same direction. Which of the following multiplies of the fundamental frequency will not produce resonance: 1/3; ½; 1, or 2?
The wave velocity, v , is the velocity at which wave crests (or any other point of the waveform) move. Important: Don’t confuse with the velocity of a particle, oscillating in a wave! f T v λ = =

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Velocity of a Wave in a Stretched String L m F v T / =
Types of Waves transversal longitudinal

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Interference Interference refers to what happens when two waves pass each other.
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lect548 - Review Chapters Covered 15,16,20 Vibrations and...

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