I want to demonstrate some activities related to sound and tuning fork among kids.
I have a couple of these including C256Hz, C 380 Hz etc.
When I put these on a wooden resonance box the sound gets amplified and continues for about 10 seconds before the energy dissipates and it stops sounding unless it is brought close to the ears. What I want is that the sound should be more loud and it should keep coming for much more time. So I want to understand how to achieve this ? What factor are involved in tuning fork - resonance box system that will make the sound louder and continue for a longer time?
Shall I buy a higher frequency Tuning fork with a bigger resonance box ? Are there any materials which can be coated on inner surfaces of the resonance box so that it does not dissipate quickly ?
Kindly give some suggestions