Practise defining coherence and interference, then identifying constructive or destructive interference from phase or path difference and observed regions.
Two sources and of sound waves are positioned as shown in Fig. 5.2.
Fig. 5.2 (not to scale)
The sources emit coherent sound waves of wavelength 0.85 m . A sound detector is moved parallel to the line from a point X to a point Y. Alternate positions of maximum loudness L and minimum loudness Q are detected, as illustrated in Fig. 5.2.
Distance is equal to distance . Distance is 7.40 m.
Explain what is meant by coherent waves.