| Resonance and Non-Resonance - 384 Hz |
A 384 Hz tuning fork is touched to three resonance boxes that are tuned to 512 Hz, 440 Hz, and 384 Hz. The box with the same frequency as the fork resonates more loudly than the others. |
| Resonance and Non-Resonance - 440 Hz |
A 440 Hz tuning fork is touched to three resonance boxes that are tuned to 512 Hz, 440 Hz, and 384 Hz. The box with the same frequency as the fork resonates more loudly than the others. |
| Resonance and Non-Resonance - 512 Hz |
A 512 Hz tuning fork is touched to three resonance boxes that are tuned to 512 Hz, 440 Hz, and 384 Hz. The box with the same frequency as the fork resonates more loudly than the others. |
| Resonance and Energy Transfer - Matched and Unmatched Resonance Boxes |
The relative efficiency of energy transfer between matched (resonant) and unmatched (non-resonant) sound boxes and the phenomenon known as "beats" are demonstrated. |
| Beat Frequency |
The beat frequency depends on the frequency difference between the tuning forks. |
| Changing the Beat Frequency |
Moving the clamp lower on the arm of the tuning fork reduces the beat frequency. |
| Near-Equal Frequencies Produce Very Slow Beats |
When the clamp is positioned near the bottom of the tuning fork arm its effect is very small, so the frequency difference between the two tuning forks will small and the beat frequency very low. |