explain how sound is being produced by the turning fork
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The geometry of the tuning fork is designed so that its natural (resonant) frequency corresponds to the desired sound. Natural frequency is the frequency that an object vibrates at when displaced by an external force, e.g., striking a tuning fork. So, the tuning fork is simply vibrating at its natural frequency.
An interesting experiment is to place two tuning forks, with the same natural frequency, side by side. Strike one of the tuning forks, and the other tuning fork will begin to resonate at the same frequency. All musical instruments rely on natural frequency to produce sound. Examples include: guitar strings, piano strings, reed in wood winds, the head on drums, and human vocal cords.
An interesting experiment is to place two tuning forks, with the same natural frequency, side by side. Strike one of the tuning forks, and the other tuning fork will begin to resonate at the same frequency. All musical instruments rely on natural frequency to produce sound. Examples include: guitar strings, piano strings, reed in wood winds, the head on drums, and human vocal cords.
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When the tuning fork is hit, the fork displaces the molecules of air inwards and outwards. These phenomenon are known as compression and rarefaction respectively.
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