The sound enters the inner ear directly when it is held on the mastoid process, which is a change in the hearing mechanism. It is done for Rinne test.
A tuning fork is a U-shaped metal object that has a handle of metal below it. It is used in hearing tests.
Thus, the difference in the mechanism of hearing when it is held on the mastoid process is the sound gets directly into the inner ear. It is done for the Rinne test.
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