long string is connected to the wall with the other hand held by the instructor. The instructor connects the free end to a frequency generator which moves the free end up and down. This produces a wave on the string with regions moving up and down and other regions not moving. What is the name of this feature?  The instructor sets the frequency to 20 hz initially. The string vibrates with a large amplitude only in the middle of the string. How many nodes are there? How many antinodes? The instructor changes the frequency so the large amplitude is in three places along the string. How many nodes are there now? How many antinodes? What is the frequency with three places in the string oscilating

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