A stationary sound wave is set up between a loudspeaker and a wall.
A microphone is connected to a cathode-ray oscilloscope (CRO) and is moved along a line directly between the loudspeaker and the wall. The amplitude of the trace on the CRO rises to a maximum at a position X, falls to a minimum and then rises once again to a maximum at a position Y.
The distance between X and Y is 33 cm. The speed of sound in air is 330ms$^{ - 1}$.
Which diagram could represent the CRO trace of the sound received at X?
1 )
3 )
4 )
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