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Physics A: Problem Set 16: Diffraction and interference

recommended reading

High Marks: 4:25–4:27, 4:35–4:36
Barron's Let's Review: 12.7 Diffraction and interference of light
physics.info: Diffraction & interference (light)
Wikipedia: Diffraction, Interference (wave propagation), Double-slit experiment, Discrete spectrum (physics), Continuous spectrum
HyperPhysics: Diffraction of sound
Khan Academy: Interference of light waves
YouTube: The brightest part of a shadow is in the middle
Mr. Machado: 09 Diffraction

sample problem

  1. Suppose you were the owner of a radio station and that you wanted to extend the range of your broadcast. Would it be wise to erect a second transmitting antenna to broadcast simultaneously with the first? How will a second transmitter affect reception? Explain your reasoning.

homework

  1. For what portion of the electromagnetic spectrum could a picket fence be used as a diffraction grating? Explain your reasoning.
  2. For each of the following examples, state whether the source of light produces a spectrum that is mostly continuous or mostly discrete. Compile your results in a table like the one below.
    Identify the spectral type with a check mark (√)
    source continuous discrete
    blow torch
    candle flame
    cathode ray tube
    emission nebula
    firefly
    fluorescent tube
    glow stick
    incandescent bulb
    laser
    LED
    neon sign
    plasma display
    the Sun
    red hot metal