Intensity and Sound Level 8 3 points A point source emits sound waves isotropically. The intensity of the waves Which of the following is correct? In the following statements, R refers to the 3.20 m from the source is 1.76 x 10- W/m?. Let us assume that the energy of the waves is conserved. distance from the sound source where the sound level is 0 dB. a. Sound waves do not exist beyond R. b. Sound waves transport no energy at distance R from the source. c. Sound waves exist beyond R, but a normal person cannot hear any sound. d. Sound waves have a negative intensity at any point beyond R. a and b only a and d only c only O c and d only O b only