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Did you complete the reading assignment? (Typically this means at least 20-30
minutes looking over the assigned sections of the book.)
☐ yes ☐ no
What happens when two pulses on a string (one coming from each end) meet in
☐ The pulses pass through each other
☐ The pulses reflect off of each other
If a loudspeaker emits spherical sound waves in all directions, what
decreases as you go farther away from the loudspeaker?
You go to a rock concert where
the sound level where you are standing is 110 dB. How does the intensity
(power/area) of sound waves compare to when you listen to the same music on your
home stereo system, 90 dB at the spot you sit?
☐ Concert intensity = Stereo intensity
☐ Concert intensity = 1.20x stereo intensity
☐ Concert intensity = 2x stereo intensity
☐ Concert intensity = 10x stereo intensity
☐ Concert intensity = 20x stereo intensity
☐ Concert intensity = 100x stereo intensity
Ralph is confused about Table 14.2 (8th edition), where the book lists
different intensity levels for different sources. For example, the table says a
vacuum cleaner has an intensity of 70 dB. What confuses Ralph, is that it seems
like a vacuum cleaner should sound louder to someone who is pushing the vacuum
cleaner than to someone who is a little farther away. How can the intensity
level be 70 dB for both people? How should you answer Ralph's question?
The comments in the next next two boxes go into a big, mostly anonymous text file that I skim through before the morning lecture, using the comments to help me plan class discussion. ("Mostly anonymous", because I can track down who made what comment, but it takes some effort on my part to do so.) Therefore, if you really want to make sure I see your question/comment and answer it individually, you should send it to me via email and not through this form.
Which part of today's assignment was particularly hard or confusing? What
would you like to spend extra time on in class?
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