define the following terms: wave, frequency, period
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Define the following terms: wave, frequency, period Draw a simple sine waveform and label these: amplitude, wavelength, crest, trough. Define the following terms: Superposition Constructive interference Destructive interference Standing wave Nodes Antinodes. The Properties of Waves - PowerPoint PPT PresentationTRANSCRIPT
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1. Define the following terms: wave, frequency, period
2. Draw a simple sine waveform and label these: amplitude, wavelength, crest, trough
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Define the following terms: 1) Superposition2) Constructive interference3) Destructive interference4) Standing wave5) Nodes6) Antinodes
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The Properties of Waves1. Reflection2. Refraction
3. Superposition4. Diffraction
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Have you ever experienced having a really bad cell phone reception in the middle of an open, urban area?
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Question:
What happens when a wave meets another wave?
Wave + Wave = ?
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Superposition (Interference)• Two waves can be ‘added’ together
• Constructive interference occurs when the two waves are in phase (i.e. crests meet crests, troughs meet troughs)
• Destructive interference occurs when they are 180 degrees out of phase (i.e. crests meet troughs)
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Constructive Interference (Antinode)
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Destructive Interference (Node)
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Ruben’s Tube
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Standing Wave, Nodes and Antinodes• Wave produced by the superposition of
two equal but opposite waves
• Antinodes – places where constructive interferences occur (double crest and double trough)
• Nodes – places where destructive interferences occur (crest + trough = zero displacement)
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Interference Pattern• Anti-nodes are formed when constructive
interferences occur where two waves are in phase because the path differences are whole numbers (0, 1, 2, 3…).
• Nodes are formed when destructive interferences occur where two wave are 180o out of phase because the path differences are ½, 1½, 2½, 3½…
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Constructive Interference
Destructive Interference
Anti Nodes (anti nodal line)
Nodes (nodal line)
Crest + CrestTrough + Trough
Crest + Trough
In phase 180o out of phasePath differences are 0, 1, 2, 3, 4…
Path differences are ½, 1½, 2½, 3½…
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