I. The sources must be close to each other.
II The waves must have the same frequency.
III. The waves must have the same amplitude.
IV. The waves must travel with the speed of light.
A. I, II and IV only
B. I, II and III only
C. I and II only
D. II, III and IV only
E. l, III and IV only
Correct Answer:
Option B – I, II and III only
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