When the Volume Control on a Stereo System Is Increased

Multiple Choice

When the volume control on a stereo system is increased, the voltage across a loudspeaker changes from V ₁ to V ₂ , and the decibel increase is given by Find the decibel increase if the voltage changes from 2.2 volts to 3.5 volts.

A) db = 9.3
B) db = 2.9
C) db = 6.3
D) db = 7.8
E) db = 4.0