Lecture 4 SSI 10 Pre Lecture

Lecture 4 SSI 10 Pre Lecture - Physics7CSSI2010...

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Physics 7C SSI 2010 Lecture 4: Interference Wrap-Up  and Introduction to the Ray Model
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Agenda Time-dependent interference (beats) Standing waves (interference due to boundaries) Ray Model: Reflection and Refraction Quiz 2
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Interference with different frequencies:  beats ΔP t(s) So far, we have only discussed interference when the two waves have the same frequency. What happens if they don’t? 1 2 3 What type of interference is occuring at times 1, 2 and 3?
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Time dependent interference: beats ΔP ΔP t(s) t(s) Both waves graphed separately The resultant wave The interference condition changes with time, from constructive to destructive to constructive etc….!!! 1 2 3
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Time dependent interference: beats The beat period The carrier period
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Time dependent interference: beats Beat Period: The time it takes to complete one cycle of constructive to destructive to constructive interference (time for loud – soft – loud) Carrier Period: The actual period of oscillation of particles in the resultant wave. Beat frequency: The number of loud – soft – loud cycles per second (inverse of the beat period) Carrier Frequency: The actual frequency of oscillation of particles in the resultant wave (the actual “note” you hear).
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Lecture 4 SSI 10 Pre Lecture - Physics7CSSI2010...

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