INTERFERENCE

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INTERFERENCE
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Interference

• When two waves meet while traveling along the
  same medium
• 2 types
• Constructive Interference
• Destructive Interference

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Constructive Interference

• When waves add up to make a larger amplitude
• Combine to make a single large pulse
• Two wave pulses on the same side

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Constructive Interference

• Waves combine without any phase difference
• When they oscillate together (in phase)

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Wave Addition

• Amplitude Intensity

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Destructive Interference

• Waves add up to make a smaller amplitude
• Two wave pulses on opposite sides subtract when
  they meet

These waves cancel b/c they are same amplitude
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Destructive Interference

• Waves combine differing by multiples of 1/2
  wavelength
• They oscillate out-of-phase

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Wave Subtraction
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At which points is there constructive and
destructive interference?
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Constructive Interference G, J, M and
NDestructive Interference H, I, K, L, and O