APHY201 2/3/2016 1 11.6 Resonance   Matching an object’s natural frequency with an external force   Since most objects have elastic properties, resonance.

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Presentation transcript:

APHY201 2/3/ Resonance   Matching an object’s natural frequency with an external force   Since most objects have elastic properties, resonance can cause them to be damaged or destroyed.   Breaking a glass with sound Breaking a glass with sound   Tacoma Narrows Bridge Tacoma Narrows Bridge   Bridge in Russia Bridge in Russia

APHY201 2/3/ Wave Motion   Oscillations that move through matter and carry energy.

APHY201 2/3/ Wave Motion   Wave speed   For a string:

APHY201 2/3/ Types of Waves   Transverse and Longitudinal   Example 1 Example 1

APHY201 2/3/ Types of Waves   Earthquakes and Water Earthquakes

APHY201 2/3/ Energy Transported by Waves

APHY201 2/3/ Reflection and Transmission of Waves   Newton’s 3 rd Law   Similar to a wave traveling Similar to a wave traveling from water into oil

APHY201 2/3/ Principle of Superposition   Constructive and destructive interference In phase or out of phase?

APHY201 2/3/ Standing Waves   Due to the superposition of the waves at certain frequencies Fundamental Frequency Overtones or Harmonics

APHY201 2/3/ In class: Problems 54, 82 Other problems ↓ 41. To find the time for a pulse to travel from one end of the cord to the other, the velocity of the pulse on the cord must be known. For a cord under tension, we have.