Answer #24

The correct answer is C: Increases by a factor of 9. Power is proportional to the amplitude squared. Voltage is a measure of amplitude for transducers. Therefore if the voltage is increase from 3 to 9 or by a multiple of 3, then the increase in power is by a multiple of 3^2 or 9. None of the other answer choices are accurate and there is enough information given to answer the question.