Which is one of the most common applications of Helmholtz resonator?

Which is one of the most common applications of Helmholtz resonator? Correct Answer Subwoofer

One of the most common applications of Helmholtz resonators is in subwoofers. Subwoofers were developed to add bass response to home stereo systems. There are different types of subwoofers that use different designs to accomplish the same purpose. These include bass reflex, infinite baffle, horn loaded and band pass.
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If a dielectric resonator has a dielectric constant of 49, then the reflection coefficient of the dielectric resonator is:
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