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## Homework Statement

A tone with frequency 2,00 * 10^3 Hz is held above a tube filled with water. The water level is increased and decreased.

When the water level is 5.7cm below the opening of the tube, the first sound maxima is heard.

When the water level is 39.3cm below the opening of the tube, the fifth sound maxima is heard.

Questions:

1. what is the wavelength?

2. What is the speed of sound in this specific experiment?

## Homework Equations

v=wavelength*frequency

## The Attempt at a Solution

My attempt is as follows:

(39.3 - 5.7) = delta distance, and there are four wavelengths between the first and the fifth maxima, therefore the answer should be:

(39.3-5.7) / 4 = 8.4

But the answer is 16.8, double my answer. Why is this?