The diagrams below each depict a wave pulse traveling to the right on a string,

Question

The diagrams below each depict a wave pulse traveling to the right on a string, incident on a boundary from thin to thick (A) and from thick to thin (B). Circle each correct answer below. A. Does the polarity switch upon reflection at the boundary? yes no How does the amplitude change upon reflection? larger smaller no change How does the amplitude change upon transmission? larger smaller no change How does the pulse width change upon reflection? wider narrower no change How does the pulse width change upon transmission? wider narrower no change B. Does the polarity switch upon reflection at the boundary? yes no How does the amplitude change upon reflection? larger smaller no change How does the amplitude change upon transmission? larger smaller no change How does the pulse width change upon reflection? wider narrower no change How does the pulse width change upon transmission? wider narrower no change

Explanation / Answer

(A) Thin to thick:

Polarity switch upon reflection - YES

Amplitude change upon reflection - NO CHANGE

Amplitude change upon transmission - SMALLER

Pulse width change upon reflection - NO CHANGE

Pulse width change upon transmission - NARROWER

(B) Thin to thick:

Polarity switch upon reflection - YES

Amplitude change upon reflection - NO CHANGE

Amplitude change upon transmission - LARGER

Pulse width change upon reflection - NO CHANGE

Pulse width change upon transmission - WIDER

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