Learning object 2 - waves phys 101
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Transcript of Learning object 2 - waves phys 101
Reflection and Transmission of Mechanical
Waves
demoweb.physics.ucla.edu
True/False Question
When a pulse is reflected from a fixed end it is not inverted:
TRUE
FALSE
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
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
True/False Question
The reflected pulse is inverted.
TRUE
FALSE
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
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
True/False Question
The transmitted pulse is inverted and the reflected pulse is not inverted.
TRUE
FALSE
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
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
Question
How did the pulse look like before it was reflected?
CORRECT!This is a fixed end so the pulse is inverted.
INCORRECT :(This is a fixed end so the pulse is inverted.
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
CORRECT!
The pulse is not inverted because it is a free end.
INCORRECT :(
The pulse is not inverted because it is a free end.
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
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