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A stretched string fixed at each end has a mass of 40.0 g and a length...

A stretched string fixed at each end has a mass of 40.0 g and a length of 7.20 m. The tension in the string is 40.0 N.
(a) Determine the positions of the nodes and antinodes for the third harmonic. (Answer from smallest to largest distance from one end of the string.)
nodes

_____0________m

_____2.40________m

_____4.80_______m

_____7.20_______m

antinode

_____1.20________m

_____3.60________m

_____6.00_______m

(b) What is the vibration frequency for this harmonic?

_____________Hz

*For part (b), I keep getting 127.3 Hz which is wrong

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