Question

Most of the human ears cannot hear sound of intensity less than :

• A. ${10}^{-12}W{m}^{-2}$
• B. ${10}^{-6}W{m}^{-2}$
• C. ${10}^{-3}W{m}^{-2}$
• D. $1W{m}^{-2}$

Answer 1

The correct option is A ${10}^{-12}W{m}^{-2}$

A human ear can hear a sound of minimum intensity ${10}^{-12}W/m^2$. This intensity sound corresponds to loudness $0dB$. So, we say that a human ear cannot hear a sound of loudness $0dB$.
A human ear can hear a sound of maximum intensity $1W/m^2.$