問題詳情
6.What is the intensity ratio of sound for the heavy truck at 1.5m(90dB) to normal conversation at 1m(60dB)?
(A)1.5
(B)103
(C)0.67
(D)1030
(E)
6.What is the intensity ratio of sound for the heavy truck at 1.5m(90dB) to normal conversation at 1m(60dB)?
(A)1.5
(B)103
(C)0.67
(D)1030
(E)