The arms of the fork are oscilllating, so the energy exchange is between potential energy in the elasticity of the arms of the fork, and kinetic energy during that part of the cycle when the arms are moving. There is also a constant loss of energy to atmospheric damping as the sound dies away.
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The some wave has the same frequency as the natural frequency of the tuning fork, the tuning fork is made to vibrate due to a process called resonance.
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tuning fork steel instrument in the shape of a U with a short handle. When struck it produces an almost pure tone, retaining its pitch over a long period of time; thus it is a valuable aid in tuning musical instruments.
A tuning fork combined with a quartz sound magnet.
harmonic resonance