Question

describe one example of an experiment (and give one equation) that shows that electromagnetic radiation is...

describe one example of an experiment (and give one equation) that shows that electromagnetic radiation is a wave.

Homework Answers

Answer #1

Thomas Young, 1801

  • pass light through two tiny adjacent slits
  • if light were particles:
    • target would be brightest where light passing through the slits overlapped
    • target would darken steadily moving away from the overlap region
    • this was not observed!
  • a pattern of light and dark stripes was observed instead
    • Young explained the stripes as a combination of diffraction and interference
    • these interference fringes are a sure sign of wave behavior

  • White areas are peak-peak or trough-trough overlaps (constructive interference)
  • black areas are peak-trough overlaps (destructive interference).

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