A Levels Physics

The diagram shows two identical loudspeakers driven in phase by a common audio-frequency
source.
loud
identical
loudspeakers
quiet
d
a
loud
quiet
audio-frequency
source
loud
Y
When a student moves along line XY, she notices that there are variations in the loudness of the
sound. The regions in which the sound is heard are alternately loud and quiet as indicated on the
diagram.
How may the distance between loud regions be reduced?
A decreasing the distance a between the speakers
B increasing distance d
c increasing the frequency of the audio-frequency source
D increasing the power output from the audio-frequency source


Deformation of Solids | 2012 - O/N - 9702/12 | Q28