Question

Sound level is a measure of intensity produced to minimum intensity which can be heard. The minimum intensity which can be heard is

• A. ${10}^{-5}W{m}^{-2}$
• B. ${10}^{-6}W{m}^{-2}$
• C. ${10}^{-8}W{m}^{-2}$
• D. ${10}^{-12}W{m}^{-2}$

Answer 1

Answer: (D)

${10}^{-12}W{m}^{-2}$

Minimum intensity that can be heard is ${10}^{-12}W{m}^{-2}$ which corresponds to a sound having loudness $0dB$.