Waves 2

If you know the frequency of two harmonics can you find the length of the pipe?.

A loudspeaker is placed at the open end of a closed pipe and connected to a signal generator. The signal generator is turned on and the frequency increased from 1000 Hz to 2000 Hz. As this happens two loud notes are heard, one at 1417 Hz and the other at 1983 Hz.

What is the length of the pipe?