Physics multiple choice question..

Question

A sound that is below the threshold of human hearing has

a. a negative intensity level (in dB)

b. a negative intensity (in W/m^2)

c. an intensity level of zero

d. an intensity level less than 1dB, but greater than 0

Answer 1

c. an intensity level of zero

Answer 2

its multiple choice, you shouldn't need help.

anyway its A.