Lesson 36 SUPERPOSITION AND INTERFERENCE
 Name: etp       Section: T1       Start Time: 10:10:43       Instructor: Dr Brian M. B_Patterson       Course: 110

1)
 The Physlet to the left shows the amplitude of the function f(t) as a function of time. The portion of the wave that falls between the two vertical red lines in the top panel is "blown up" in the middle panel. You can tell from looking at the form of f(t) that it is the sum of two distinct sine waves, corresponding to two distinct tones or musical pitches. What you hear is the wave that results from the superposition or sum of those two distinct waves. Which of the following examples produces a beat wave with the greatest beat frequency? Please explain how you can tell, and please also explain what determines the beat frequency you get when you add two waves together. Note: Feel free to "play around" with other f(t) functions! Just type your function into the textbox [following the format you see in the f(t) textbox originally] and click the "New" button. You can turn the sound on/off by checking or unchecking the "Mute" option. Have fun!

3) Two identical pulses travel toward eachother on a string. At the instant they overlap completely, the displacement of the string is

1. exactly zero.
2. Half the amplitude of one of the pulses.
3. equal to the amplitude of one of the pulses.
4. twice the amplitude of one of the pulses.

Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):

You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.

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