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# Pulse Behavior through Different Media

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## Pulse Behavior through Different Media Answer Key

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.

If a pulse originates from the less dense end of a rope on the left side, a portion of the energy carried by the incident pulse is reflected and returns inverted towards the less dense end of the rope. What is the disturbance that returns to the left after bouncing off the boundary known as?
1. the inverted pulse
2. the incident pulse
3. the transmitted pulse
4. the reflected pulse
2.

At which end of the rope is the wave speed is always greatest?
1. in the less dense end
2. in the more dense end
3. Wave speed is the same throughout.
3.

If a pulse originates from the less dense end of the rope on the left side, a portion of the energy carried by the incident pulse is transmitted into the thick rope. What is the disturbance that continues moving to the right known as?
1. the reflected pulse
2. the transmitted pulse
3. the incident pulse
4. the inverted pulse
4.

At which end of the rope is the wavelength is always greatest?
1. in the less dense end
2. in the more dense end
3. Wavelength is the same throughout.
5.
If an incident pulse transmits from the more dense medium, that transmitted pulse is traveling more slowly than the reflected pulse in the less dense medium.
1. True
2. False
6.

The transmitted pulse in the less dense medium has a smaller wavelength than that of the reflected pulse in the more dense medium.
1. True
2. False
7.

The speed and the wavelength of the reflected pulse are the same as the speed and the wavelength of the incident pulse.
1. True
2. False
8.

Explain in which situation will the reflected pulse of an incident pulse will become inverted.
• The reflected pulse becomes inverted when a transmitted wave in a less dense rope is heading towards a boundary with a more dense rope.
9.
Explain why the original frequency of a wave is not altered by crossing a boundary where there is a change in media density, and reflecting back.
• The reflected pulse was created by the vibrations of the incident pulse. As a result, they will have the same frequency, since the incident and the reflected pulse share the same medium (eg., starts in less dense and reflection returns to less dense).
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