Answer :

Final answer:

The valve system in passive level-dependent hearing protection reduces sound intensity when it exceeds a certain threshold by opening and closing valves. This helps protect the ear from loud noises while still allowing the person to hear softer sounds.

Explanation:

The valve system in passive level-dependent hearing protection works by reducing sound intensity when it exceeds a certain threshold. This system relies on the opening and closing of valves to regulate the flow of sound waves into the ear. When the sound is below the threshold level, the valves remain open, allowing normal hearing. However, when the sound intensity exceeds the threshold, the valves close partially or completely, reducing the amount of sound entering the ear.

For example, in the case of earmuffs with valve systems, the valves act as sound gates. When the sound is below the threshold, the valves are open, and sound waves can enter freely. But when the sound intensity surpasses the threshold, the valves close, blocking off some of the sound waves. This valve system helps protect the ear from loud and potentially damaging noises while still allowing the person to hear softer sounds. It is a passive system because it does not require any external power source or active electronic components to function.

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Rewritten by : Barada