a. No. b. Yes. c. Yes. d. No.
Work Step by Step
a. A sound level of zero dB corresponds to the threshold of hearing at 1000 Hz; there is still sound. b. Equation 16.15 makes sense for negative sound levels. A negative sound level can be assigned to a sound that is weaker (i.e., has less intensity) than a sound with a sound level of 0 dB. c. If there is zero intensity, the displacement amplitude is zero, and there is no sound. d. One cannot have less sound than no sound.