Question

A 680 Hz tuning fork is held over a long vertical tube full of water. If the tube is 1.00 m long, how many resonances will be heard as the tube is allowed to empty from the bottom?

Answer 1

resonances will be heard each odd number of quarter wavelengths.

Determine the wavelength (f*lambda=wavespeed), divide it by four, then figure out the odd multiples that are less than 1 meter.

Answer 2

12