A loudspeaker and a microphone are positioned in front of a wall. The loudspeaker produces a sound that is picked up by the microphone. The microphone is linked to an oscilloscope, which is adjusted so that one division on the screen corresponds to $0.01\,\text{s}$. The microphone detects both the initial sound and the echo. The speed of sound in air is $300\,\text{m s}^{-1}$. What is the separation between the loudspeaker and the wall?
- A$6.0\,\text{m}$
- B$12\,\text{m}$
- C$24\,\text{m}$
- D$48\,\text{m}$