A closed organ pipe has a length of 2.40 m?

A closed organ pipe has a length of 2.40 m.

a.) What is the frequency of the note played by the pipe? Use
343 m/s as the speed of sound.

b.) When a second pipe is played at the same time, a 1.40 Hz beat note is heard.
By how much is the second pipe too long?

The a.) problem’s solution is 35.7 Hz. and b.) problem’s solution is 0.10 m

The actual problem here is that I don’t know how to properly solve b.)

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