04 Oscillations, Waves After Class

Today: Notes about quiz; Oscillations, Waves, Doppler effect ,[object Object],[object Object],Waves by hb19 on flickr

Results of first quiz THANK YOU to those students who took the quiz!

Brownian motion clicker question

Scanning Tunneling Microscopy -- pseudocolor 6. Scanning Tunneling Microscopy, color Scanning Tunneling Microscopy: Think of those pretty pictures we looked at in class of iron atoms on an atomically flat copper surface. Q: Why are different parts of the image different colors than others? a. Different elements emit different colors of light. b. The color of the light detected by the microscope depends on the distance between the tip and the surface. c. The colors were invented by the IBM scientists to make the easier to make sense of (pseudocolor).

Self-sustaining oscillations are usually energy flowing from one form to another, back and forth ,[object Object],[object Object],[object Object]

Mass on a spring…oscillation has a frequency and an amplitude ,[object Object],[object Object],[object Object],[object Object],Oleg Alexandrov wikipedia Amplitude is displacement from equilibrium

Oscillations are a foundation of waves they can easily be visualized as waves User:Evil_saltine wikipedia Oleg Alexandrov wikipedia

A wave is a disturbance that propagates through space…it carries energy from one place to another. ,[object Object],[object Object],[object Object],[object Object],We also think about waves that don’t carry energy…examples?

Let’s brainstorm on waves that carry energy ,[object Object]

Kinds of waves in physics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],http://www.3sigma.ca/gravityWaves.html

Wave has properties of an oscillation ( frequency and an amplitude ) plus speed and wavelength ,[object Object],[object Object],[object Object],[object Object],[object Object],http://www.3sigma.ca/gravityWaves.html

Frequency and speed are the fundamental properties of a wave ,[object Object],[object Object],[object Object],(Wave speed = wavelength x frequency) Wave table demo Frequency is fundamental Energy transfer Wavelength = Wave speed frequency

Clicker Question—Properties of waves ,[object Object],[object Object],[object Object],[object Object],[object Object]

Ripple tank experiments with speed, frequency, wavelength ,[object Object],[object Object],[object Object],[object Object]

Clicker question I am going to decrease the frequency of the oscillating source. What will happen to the wavelength? A. Nothing B. Wavelength will increase C. Wavelength will decrease D. Impossible to determine http://www.falstad.com/ripple/

Clicker Question—Wavelength, frequency, speed ,[object Object],[object Object],[object Object],[object Object]

Clicker Question—Wavelength, frequency, speed ,[object Object],[object Object],[object Object],[object Object],Wave speed = wavelength x frequency Wavelength = Wave speed frequency

Transverse Waves and Longitudinal Waves ,[object Object],[object Object],[object Object],[object Object],[object Object],Transverse wave demo From Zhang Jiang (our TA): The speed of longitudinal waves and transversal waves differ If there is an earthquake you will feel the vertical shake before the horizontal shake

Key concepts: ,[object Object],[object Object],[object Object]

Doppler effect ,[object Object],[object Object],[object Object],[object Object]

Clicker Question to think about: Wind and Doppler Effect

04 Oscillations, Waves After Class

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04 Oscillations, Waves After Class