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.
Ex) Calculate
the distance between two slits in a Double Slit Experiment if the wavelength of
the light used is 5 X 10 -7 m and the distance between the central
maximum and the first order bright line is 2 X 10 -2 m The distance
from the slits to the screen is 4 meters.
Step 1 -
Underline all the information
Step 2
- Turn the info into the correct letters
Step 3 - Substitute and Solve
l/d = x/L
Answer d = ______________
Question: If
they give you d, L and x and asked
you to find the COLOR of the light used, what would you do? Where would you go
to find the color?
Answer:
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? ___________