can you solve with working out this physics question on waves?

The speed of sound in air is 340 m s-1. Ryan and Lee are investigating some properties of sound, and sound systems. They have been given a signal generator that provides frequencies in the audible range, a small loudspeaker, and an oscilloscope that they use to observe the amplitude of the signal from a microphone. oscilloscope signal generator 1.0 m small loudspeaker microphone They first adjust the signal generator so that sound is emitted from the loudspeaker. The figure below shows the oscilloscope trace of the signal from the microphone. vertical scale 1 division = 20 mv horizontal scale 1 division = 100 us