C19 Waves

Chapter 19 Vibrations & Waves Mar 6, 2010 Physics 1 (Garcia) SJSU Part IV: Sound

Vibrations ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Oscillating motion of a mass on a spring

Period ,[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Note: Measure the period of a pendulum in lab.

Frequency ,[object Object],[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU (Period) 1

Amplitude ,[object Object],Amplitude

Waves ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Water waves Light waves Sound Radio String

Transverse Waves ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Wave Motion Amplitude Amplitude

Doing “The Wave” ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Video analysis indicates that it takes only a few dozen fans leaping to their feet with their arms up to trigger a wave. Once started, it usually rolls in a clockwise direction at a rate of about 40 feet per second, or about 20 seats per second. At any given time, the wave pulse is about 15 seats wide.

Longitudinal Waves ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Wave Motion Amplitude Amplitude A crowd can do a longitudinal wave by moving side-to-side instead of up-and-down

Wavelength ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Longitudinal Transverse

Wave Speed ,[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Water waves at the beach move a few miles per hour

Tsunami Waves ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU The tsunami of 26 December 26 th 2004 was produced by an earthquake whose epicenter was located off the coast of Indonesia in the Indian Ocean. The death toll is estimated at over a quarter of a million persons. Animation by Vasily V. Titov

Wave Relations ,[object Object],[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU (Wave speed) (Frequency) (Wave speed) (Wavelength)

C heck Yourself ,[object Object],[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU 6 m/s 2 m

Demo : Hearing Sound ,[object Object],[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU

Hearing in Animals Frequency range varies widely, depending on natural adaptation using sound to communicate, locate food, avoid predators, etc.

Constructive Interference ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU

Destructive Interference ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU

Demo : In & Out of Phase ,[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Out of Phase

Noise-Canceling Headphones ,[object Object],External Noise Canceling Sound

Demo : Speaker Baffle ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU

Standing Waves ,[object Object]

Standing Waves and Phase Mar 6, 2010 Physics 1 (Garcia) SJSU Standing waves are another example of constructive and destructive interference.

Doppler Effect ,[object Object],[object Object],[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU

Demo : Doppler Shift ,[object Object],Mar 6, 2010 Physics 1 (Garcia) SJSU Higher Frequency Lower Frequency Longer Wavelength Shorter Wavelength

C19 Waves

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C19 Waves