E.     Wave Nature of Light

 

2 Competing Theories:    1. __________________  2. ____________

 

Behavior of Light Supporting _____________________

 

1. _____________ – light ___________ into the region behind an obstacle

 

 

               

2.    ____________________________ – Young’s Double Slit Late 1800's

 

 

Review of Interference

 

 

Lines of Constructive and Destructive Interference

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

See Reference Table

 

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? ____