Project cost ($):
1 day to prepare, 1 day for observation
Easily found. Tuning forks may be purchased from musical instrument retailer shops.
Table of Contents
This experiment was conducted to find out how the resonant frequency generated by a tuning fork will change at different temperatures.
The frequency of sound from a tuning fork will decrease as the temperature increases.
Compress, expand, frequency, tone, Young’s modulus, density, radius
The materials required for this science fair project:
1. For this experiment, the independent variable is the temperature of the tuning fork. The dependent variable is the resonant frequency of the tuning fork. This is determined by measuring the frequency with a frequency sensor and scope. The constants (control variables) are the resonant frequency of the tuning fork, the material of the tuning fork and the dimensions of the tuning fork.
It is observed that when the temperature of the tuning fork is increased, there is a slight reduction in the frequency sound generated.
The hypothesis that the frequency of sound from a tuning fork will decrease when the temperature increases is proven to be true. As the temperature of the tuning fork increases, the atoms inside the fork will gain kinetic energy and vibrate more. This will cause the fork to expand and become longer. As can be seen from the formula given in the overview section, the frequency of the tuning fork is inversely proportional to the square of the tuning fork length. Therefore any slight increase in the tuning fork length will cause a reduction in the sound frequency produced.
What would happen if the experiment was repeated by using a tuning fork made from a different material?
Tuning Fork - http://en.wikipedia.org/wiki/Tuning_fork