04-superposition-interference-reflection-and-resonance

# 04-superposition-interference-reflection-and-resonance - 18...

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18 4. Superposition, Reflection and Resonance Heinemann Wk Topic Section Pages Qs Superposition Pg 21-22 Pg 25 5, 7, 9 Straight-line propagation Reflection Regular and Diffuse Reflection Reflection, Absorption, Transmission Pg 28-29 Pg 29-30 Pg 30 Pg 32 Pg 35 Pg 35 Pg 35 Pg 35 1 5, 8 7 3, 6, 4. Superposition, Reflection and Resonance Resonance Superposition Two pulses travelling along a medium will pass through each other without being altered. To find the total wave disturbance at any time, the individual displacements of each wave are added at each point. When different waves pass through the same region of space, the individual waves add together to produce the resultant wave. This is called superposition . Usually light travels in straight lines, whether it is emitted or reflected, until it meets something that changes its direction. The path of light can be represented by light rays which we draw as straight lines. A set of light rays is called a light beam. Pulse A Pulse B Time 0 Pulse A and B combined Time 1 Pulse A Pulse B Time 2

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20 On the previous page, the superposition showed examples of constructive and destructive interference. Constructive Interference If two pulses pass through each other, and their displacement is in the same direction then the pulses reinforce each other and add together. This is called constructive interference. Constructive interference will result in louder sound or brighter light. Destructive Interference If the displacement of the two pulses is in opposite directions then the two pulses cancel each other out. This is called destructive interference. Destructive interference will result in softer sound

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04-superposition-interference-reflection-and-resonance - 18...

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