# IUB PHYS-P 105 - Resonance and standing waves (2 pages)

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## Resonance and standing waves

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## Resonance and standing waves

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Resonance and standing waves

Lecture number:
9
Pages:
2
Type:
Lecture Note
School:
Indiana University, Bloomington
Course:
Phys-P 105 - Basic Physics of Sound
Edition:
1
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Unformatted text preview:

PHYS 105 1nd Edition Lecture 9 Outline of Last Lecture I Doppler Effect and Intensity Outline of Current Lecture II Resonances of physical systems III Standing Waves IV Sound Pressure Current Lecture I II Resonances of physical systems Resonance Constructive interference o Wave and its reflection can interfere constructively at certain frequencies o Provide natural sound frequencies for music instruments Resonance of a vibrating system includes o Resonance Frequency f o 2 f 1 o Bandwidth Change in frequency of frequencies at 0 71 of f maximum amplitude o Q Value of resonance f 0 f Standing Waves Standing wave Incoming and reflective waves can interfere and produce standing wave modes resonances o Has regions of minimum amplitude Nodes o Has regions of maximum amplitude Antinodes Standing waves on a string Standing waves are resonances of the vibrating system Standing wave Stationary and wave Wave reflection Wave reflection changes phase 180 from a fixed end and no phase change from a free end Velocity of wave on a string T o v These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III Sound Pressure pressure is force per unit area Sound pressure is the pressure exerted by the sound wave Unit Newton per unit area or N m 2 or Pascal When displacement is high or low pressure is zero When pressure is high or low displacement is zero Pressure disturbance at the open end of a pipe o Is a fixed end Pressure disturbance at the closed end of a pipe o Is a free end

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