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Waves

Tsunami info from NOAA http://www.pmel.noaa.gov/tsunami/indo_1204.html http://www.youtube.com/watch?v=BvbBgh9ux6A Japan 2011. Waves. Homework http://www.atmosedu.com/202Physics/wavesearthactivity.html. Systems with a stable equilibrium point often exhibit Oscillations.

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Waves

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  1. Tsunami info from NOAA http://www.pmel.noaa.gov/tsunami/indo_1204.html http://www.youtube.com/watch?v=BvbBgh9ux6A Japan 2011 Waves Homework http://www.atmosedu.com/202Physics/wavesearthactivity.html

  2. Systems with a stable equilibrium point often exhibit Oscillations • B is a stable equilibrium point because • When the ball is pushed to the right from B the force of gravity acts to pull it back to B • And when the ball is pushed to the left from B the force of gravity acts to pull it back to B

  3. The Period of an Oscillating system is the time it takes to complete one full cycle The period is the time it takes to go from A over to C and back to A.

  4. The frequency of an Oscillating system is the number of cycle per second and is just 1/Period The frequency unit of cycles per sec (1/s) has the special name Hertz (Hz)

  5. The frequency of an Oscillating system is the number of cycle per second The frequency unit of cycles per sec (1/s) has the special name Hertz (Hz) What is the frequency of vibration for a humming bird’s wings that has a period of 0.02 second?

  6. The frequency of an Oscillating system is the number of cycle per second The frequency unit of cycles per sec (1/s) has the special name Hertz (Hz) What is the frequency of vibration for a humming bird’s wings that has a period of 0.02 second?

  7. Since the frequency of an Oscillating system is the number of cycle per second, the period (number of seconds per cycle) is: A seismic signal has a frequency of 0.2 Hz. What is the period of this signal?

  8. Since the frequency of an Oscillating system is the number of cycle per second, the period (number of seconds per cycle) is: A seismic signal has a frequency of 0.2 Hz. What is the period of this signal?

  9. Period Period

  10. Longitudinal wave (like sound, or P-waves through Earth) Transverse waves (like water waves, light, S-waves through Earth)

  11. Constructive interferance Destructive Interferance

  12. Standing Waves (Interferance pattern that results when a wave traveling to the right interfers with an identical wave traveling to the left.

  13. Doppler Effect: A shift in frequency due to the relative velocity of source and observer

  14. Refraction Waves bend as they go from mediums with different wave speeds.

  15. reflection Reflected energy + transmitted Energy =100 %

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