Two sound sources, which emit sounds of wavelength 1 meter and are operating in phase, are separated by a distance of 2 meters. Source A has a power output of 10 Watts and source B an output of 20 Watts.
In the first case, only source A is on. In the second case, both sources are on. Calculate the difference in intensity level between the first and second cases at a point on the perpendicular bisector of the line joining the two sources and two meters from this line. (Note: Pressure is not a vector, so even though the waves are not traveling parallel to each other, the amplitudes are not to be added vectorially. Pressure is treated as a vector only in adding pressure amplitudes to allow for phase differences in waves).