Page 40 - WAVES

Interference of Sound Wave 1. The two loud speakers are the sources of the
two coherent sound waves as they are
Occurs when two coherent sound waves
connected to the same audio signal generator.
interact on the basis of the principle of 2. A student will hear alternating loud and soft
superposition to produce a pattern of sounds as he walks along the straight path

alternating loud and soft sounds .
(XY) at a distance of D from the
loudspeakers.

3. The alternating loud and soft sounds is
caused by interference of the sound waves.
Loudspeaker
X
Interference
K
Audio signal L pattern
generator K

Audio signal generator L K = Loud sound

K
L = Soft sound
L

K

L

Loudspeakers K
Y Loud sound:
a= the distance between the two loudspeakers

Constructive Interference
ax D =Distance between the loudspeakers and the path _________________________
along which interference can be detected
λ = λ = The wavelength of sound waves is influenced by the Soft sound :
D frequency of the audio signal generator.
Destructive Interference
x = Distance between two consecutive positions where _________________________
loud sound is heard 40