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Physics homework

AMC
in Homework Help

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a. What are the three longest wavelengths for standing waves on a 240cm long stiring that is fixed at both ends?

 

b. if the frequency of the second longest wavelength is 50 hz, what is the frequency of the third longest wavelength?

 

can someone walk me through how to solve this?

 

thanks

Hint - If the string is fixed at the ends, then when you sketch a waveform these are points which cannot move.

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