9. A long, taut string is attached to a distant wall (see figure). A demonstrato

Question

9. A long, taut string is attached to a distant wall (see figure). A demonstrator moves her hand and creates a very small amplitude pulse which reaches the wall in a time to. A small red dot is painted on the string halfway between the demonstrator's hand and the wall. For each question, state which of the actions a-k (listed to the right) taken by itself will produce the desired result. For each question, more than one answer may be correct. If so, give them all. How, if at all, can the demonstrator repeat the original experiment to produce: A pulse that takes a longer time to reach the wall. More than one answer may be correct. If so, give them all Explain A pulse that is wider than the original pulse. More than one answer may be correct. If so, give them all. Explain

Explanation / Answer

PART A

pulse take longer time if speed is less:

e) use heavier string

g) decrease the tension

PART B

wider pulse means greater wavelength

Wavelength = speed/frequency

wavelength is increased by increasein speed and decrease in frequency

b) it causes decrease in frequency

f) using lighter string will increase speed

h) increase in tension increases velocity

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