An audiometer is a machine that tests a person’s hearing by producing tones across the speech spectrum. During a hearing test, an audiometer produces a pure tone with a frequency of 2,000 hertz (cycles/second). The given function represents the change in pressure, , in millipascals, relative to the normal air pressure in the room as a function of time, t, in seconds, after the pure tone is produced.

What is the change in air pressure when the pure tone is produced?

A.
2 millipascals
B.
0 millipascals
C.
millipascals
D.
1 millipascals