learning object 2 - waves phys 101
TRANSCRIPT
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Reflection and Transmission of Mechanical
Waves
demoweb.physics.ucla.edu
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True/False Question
When a pulse is reflected from a fixed end it is not inverted:
TRUE
FALSE
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CORRECT!When a pulse is reflected from a fixed end it is inverted!
As the pulse reaches the end, the string exerts an upward force on the rigid support and the rigid support exerts an equal and opposite force on the string
http://astarmathsandphysics.com/a-level-physics-notes/waves-and-oscillations/a-level-physics-notes-reflection-of-waves-html-m5bffd405.gif
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INCORRECT :(When a pulse is reflected from a fixed end it is inverted!
As the pulse reaches the end, the string exerts an upward force on the rigid support and the rigid support exerts an equal and opposite force on the string
http://astarmathsandphysics.com/a-level-physics-notes/waves-and-oscillations/a-level-physics-notes-reflection-of-waves-html-m5bffd405.gif
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True/False Question
The reflected pulse is inverted.
TRUE
FALSE
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CORRECT!The reflected pulse is inverted.
The blue string serves as a fixed end and thus the reflected pulse is inverted.
http://www.physicsclassroom.com/Class/waves/u10l3a6.gif
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INCORRECT :(The reflected pulse is inverted.
The blue string serves as a fixed end and thus the reflected pulse is inverted.
http://www.physicsclassroom.com/Class/waves/u10l3a6.gif
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True/False Question
The transmitted pulse is inverted and the reflected pulse is not inverted.
TRUE
FALSE
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CORRECT!Both the transmitted pulse and the reflected pulse are not inverted.
The red string serves as a free end and thus, the reflected pulse is not inverted.
http://www.physicsclassroom.com/Class/waves/u10l3a7.gif
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INCORRECT :(Both the transmitted pulse and the reflected pulse are not inverted.
The red string serves as a free end and thus, the reflected pulse is not inverted.
http://www.physicsclassroom.com/Class/waves/u10l3a7.gif
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Question
How did the pulse look like before it was reflected?
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CORRECT!This is a fixed end so the pulse is inverted.
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INCORRECT :(This is a fixed end so the pulse is inverted.
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True/False Question Match the incident pulse with the correct reflected pulse (free end).
A
B
C
Dhttp://dev.physicslab.org/Document.aspx?doctype=5&filename=WavesSound_FixedFreeReflections.xml
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CORRECT!
The pulse is not inverted because it is a free end.
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INCORRECT :(
The pulse is not inverted because it is a free end.
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Important ConceptsFixed end -> pulse is inverted
Free end -> pulse is not inverted
When pulse is traveling to a different string which is more dense, the pulse is inverted
When pulse is traveling to a different string which is less dense, the pulse is not inverted
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Important Concepts
http://www1.union.edu/newmanj/Physics100/Light%20as%20a%20Wave/outofphasewaves.gif
http://www.schoolphysics.co.uk/age16-19/Wave%20properties/Wave%20properties/text/Phase_change/images/3.png