Ten questions. The result tells you which lessons you may skip.
In a sound wave travelling in one direction, the kinetic energy and the potential energy of a small slab of air are
At some point in a sound wave in air the extra pressure is \(2.0\,\text{Pa}\). Take \(B = 1.39 \times 10^5\,\text{Pa}\). The potential energy per unit volume there is
The displacement amplitude of a sound is doubled at the same frequency. Its average energy density becomes
A sound in air, with \(\rho = 1.2\,\text{kg/m}^3\) and \(v = 340\,\text{m/s}\), has a pressure amplitude of \(0.30\,\text{Pa}\). Its intensity is about
A point source sends out \(5.0\,\text{W}\) of sound uniformly. The intensity \(5.0\,\text{m}\) away is about
You move from \(10\,\text{m}\) to \(30\,\text{m}\) away from a long, straight, busy highway. The intensity of its noise becomes
A sound has an intensity of \(1.0 \times 10^{-5}\,\text{W/m}^2\). Its sound level is
A sound at \(80\,\text{dB}\) is compared with one at \(50\,\text{dB}\). Its intensity is greater by a factor of
A sound level of \(0\,\text{dB}\) means
A violin and a harmonium play the same note at the same sound level. The two sounds differ in