2 Competing Theories: 1. __________________ 2. ____________
1. _____________ – light ___________ into the region behind an obstacle
2. ____________________________ – Young’s Double Slit Late 1800's
If you draw a line from each slit to the 1st order bright line, you will notice
that one line is longer than another. The ___________ between these two
lines is _______________________
Constructive Interference causes _________ Lines.
Destructive Interference causes ___________Lines.
More wave behaviors of light
Polarization - ____________________ of a beam of light producing light that vibrates in only one plane
- proves light is a ___________________ wave - it has an __________
Doppler Effect for light
There is a change in the observed _____________________________(color) of light
as a very fast source of the light __________________________from an observer.
¨ Observed in ______________moving stars
Memory Trick - "_______________TO " "_________ AWAY"
Star's colors become _____________
Star's colors become _____________________
Summary - Why do we think light is a wave?
Diffraction - _____________________________
Interference - ___________________________
Polarization - _________________________________________
Doppler Effect - ______________________________
Electromagnetic Radiation - Wavelength and Frequency
Which one has the smallest wavelength? (hint: most penetrating)
Which one has the smallest frequency? (hint: how are wavelength and frequency related?)
Which color has the greatest wavelength? _________smallest? ____