An aging gentleman suspects that his hearing is failing. he sees a specialist who performs this test to determine the precise nature of his suspected hearing loss.

The answer is "audiometry test".

An audiometry exam tests your capacity to hear sounds. Sounds fluctuate, in view of their uproar (force) and the speed of sound wave vibrations (tone).  

Hearing happens when sound waves animate the nerves of the internal ear. The sound at that point ventures out along nerve pathways to the cerebrum.  

Sound waves can head out to the internal ear through the ear waterway, eardrum, and bones of the center ear (air conduction). They can likewise go through the bones around and behind the ear (bone conduction).

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

the first two-party system consisted of the federalist party, who supported the ratification of the constitution, and the democratic-republican party or the anti-administration party (anti-federalists), who opposed the powerful central government, among others, that the constitution established when it took effect in