Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
Number 1 -- While playing, two children create a standing wave in a rope as shown in the diagram below. 0013
A third child participates by jumping the rope. 0018
What is the wavelength of this standing wave? 0021
Well, it looks like that is showing half a wavelength because if I were to continue that wave, we would have to go back to there, for a total of 8.6 meters, so the wavelength of that wave must be 8.6 m. 0023
Number 3 -- Sound waves strike a glass and cause it to shatter. How sad. 0065
This phenomenon illustrates -- well that is resonance, Number 1. 0069
Number 4 -- A sound of constant frequency is produced by the siren on top of a firehouse. 0077
Compared to the frequency produced by the siren, the frequency observed by a firefighter approaching the firehouse -- so if the firefighter is coming closer to it, the Doppler Effect says, they are going to observe a higher frequency. 0083
Number 5 -- The super position of two waves traveling in the same medium produces a standing wave pattern if the two waves have -- well if the two waves have the same frequency, the same amplitude and travel in the same direction, they are not going to interfere. 0100
If they have the same frequency, the same amplitude and travel in opposite directions, you are going to get a standing wave. 0114
There is the right answer. Correct answer to Number 5 is Number 2. 0119
Number 6 -- The diagram below represents a standing wave. 0127
The number of nodes and anti-nodes shown in the diagram is...?0130
Standing waves and water are produced more often by periodic water waves being absorbed at the boundary with the new medium. 0190
Well, that is not going to do it -- refracting at a boundary with a new medium -- No...0198
...Diffracting around a barrier -- now that is bending around the barrier, but that is not going to give you standing waves...0203
...Reflecting from a barrier -- Yes -- that way you get the same amplitude, same frequency traveling in an opposite direction. 0208
So the correct answer to Number 8 is Number 4. 0215
Hopefully, this went well as we finished up the page on wave behaviors, but if it did not go so well, now would be a great time to go review it and if it did go well, well, keep moving on to the higher level questions. 0219
Thanks everyone for your time and make it a great day!0230
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