試題詳解

29. A transverse wave traveling along a string transports energy at a rate r. If we want to double this rate, we could
(A) increase the amplitude of the wave by a factor of 8.
(B) increase the amplitude of the wave by a factor of 4.
(C) increase the amplitude of the wave by a factor of 2.
(D) increase the amplitude by a factor of √2.
(E) increase the amplitude by a factor of √8.