Introduction to Modern Physics
Why classical physics needed new ideas about light, matter, and energy
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showmethephysics.com / Assessment
Modern Physics - 20th Century
I. Dual Nature of Light - Light appears to exhibit 2 characteristics:
Wave or Particle????
A. Review - 19th Century
Experiments Supporting Wave Theory
1) Interference - "Double Slit Exp." - constructive/ destructive
2) Polarization - "Filtering of Light - Light waves have orientations
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3) Diffraction - Spreading out of Light behind a barrier
4) Doppler - Color Shift of Light - "Blue to, Red Away"
Review Explain This!
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Young's double-slit experiment showed bright and dark bands of light. Which wave behavior does this demonstrate?
2. Polarization of light is evidence that light waves have what property?
3. Light spreading out after passing the edge of a barrier is called…
4. A galaxy is moving away from Earth. Its light will appear…
5. Why couldn't a picket fence actually polarize light?