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

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Presentation on theme: "-Waves at Boundaries -Reflection -Interference of Waves Physics Mrs. Coyle Coyle, Greece, 2009, Island of Antipaxos."— Presentation transcript:

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

2 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.

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

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

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

6 Pulse travelling from less dense to more dense medium. What happens to the pulse at the interface? http://www.dacc.edu/~qchen/P102/labs/LAB5.HTM

7 Reflection of a Pulse from a Fixed End What is the direction of the reflected pulse? http://www.dacc.edu/~qchen/P102/labs/LAB5.HTM

8 Reflection of a Wave from a Fixed End: the pulse returns inverted http://openlearn.open.ac.uk/file.php/3524/TA212_2_008i.jpg

9 Reflection of a Pulse from a Free End What is the direction of the reflected pulse? http://www.dacc.edu/~qchen/P102/labs/LAB5.HTM

10 Wave on a String (Applet) http://phet.colorado.edu/sims/wave-on-a- string/wave-on-a-string_en.html http://phet.colorado.edu/sims/wave-on-a- string/wave-on-a-string_en.html

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

12 Constructive Interference: resulting wave has a greater amplitude.

13 Destructive Interference: Resulting wave has a smaller amplitude.

14 The displacements are added algebraically at the given point in time.

15 Interference http://ircamera.as.arizona.edu/NatSci102/NatSci102/movies/interference.gif

16 Superposition Simulation: Constructive and Destructive Interference (string with loose or fixed end) http://www3.interscience.wiley.com:8100/legacy/college/halliday/047 1320005/simulations6e/index.htm?newwindow=truehttp://www3.interscience.wiley.com:8100/legacy/college/halliday/047 1320005/simulations6e/index.htm?newwindow=true

17 One Wave Two Waves Interfering

18 Interference in Water Waves

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