-Waves at Boundaries -Reflection -Interference of Waves Physics Mrs. Coyle Coyle, Greece, 2009, Island of Antipaxos.

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Presentation transcript:

-Waves at Boundaries -Reflection -Interference of Waves Physics Mrs. Coyle Coyle, Greece, 2009, Island of Antipaxos

How is the speed of a wave affected when a wave enters from one medium to another? The speed depends on the medium. It does not depend on frequency and amplitude. It remains constant in a given medium at the same conditions. When a wave enters a different medium, its speed changes but its frequency remains the same.

Speed of a Wave, v = f For a given medium, v=constant.

What does a high or low amplitude indicate? Low Amplitude High Amplitude

What happens when a wave reaches a boundary? Part of the incident wave is transmitted and part of it is reflected.

Pulse travelling from less dense to more dense medium. What happens to the pulse at the interface?

Reflection of a Pulse from a Fixed End What is the direction of the reflected pulse?

Reflection of a Wave from a Fixed End: the pulse returns inverted

Reflection of a Pulse from a Free End What is the direction of the reflected pulse?

Wave on a String (Applet) string/wave-on-a-string_en.html string/wave-on-a-string_en.html

Interference When two pulses pass the same point at the same time the waves superimpose either constructively or destructively. –Constructive Interference –Destructive Interference

Constructive Interference: resulting wave has a greater amplitude.

Destructive Interference: Resulting wave has a smaller amplitude.

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Interference

Superposition Simulation: Constructive and Destructive Interference (string with loose or fixed end) /simulations6e/index.htm?newwindow=truehttp://www3.interscience.wiley.com:8100/legacy/college/halliday/ /simulations6e/index.htm?newwindow=true

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