Question
Question: Three waves, all having the same amplitude and wavelength, travel along a string in the same directi...
Three waves, all having the same amplitude and wavelength, travel along a string in the same direction. One of the wave has phase constant of 45°. The phase constants of the other waves, if all three together produce fully destructive interference, are:
A
1800 and 2700
B
1350 and 2550
C
1650 and 2850
D
1800 and 3150
Answer
1650 and 2850
Explanation
Solution
For fully destructive interference all waves must have phase difference of 1200 with respect to each other. Thus phase constants are (450 + 1200) and (450 + 2400).