Two identical but separate strings, with the same tension, carry sinusoidal waves with the same frequency.Wave A has an amplitude that is twice that of wave B and transmits energy at a rate that is __________ that of wave B.
A)half
B)twice
C)one-fourth
D)four times
E)eight times

Question

Quizplus · Accepted Answer

The rate of transmission of energy is proportional to the square of the amplitude. Since wave A has an amplitude that is twice that of wave B, it transmits energy at a rate that is four times that of wave B (2^2 = 4). Therefore, the answer is choice D, four times.

Two Identical but Separate Strings, with the Same Tension, Carry