alleryStart learning →Two identical waves, each with amplitude 3.0 m, arrive at the same point in pure constructive interference. What is the amplitude of the resultant wave?
A1.5 m
B3.0 m
C6.0 m
D9.0 m
Answer & Solution
Correct answer: C. 6.0 m
1. Pure constructive interference of two waves with the same amplitude produces a resultant with twice the amplitude of the individual waves.
2. Each wave has amplitude 3.0 m.
3. Twice 3.0 m is 6.0 m.
4. 9.0 m would come from squaring the amplitude rather than doubling it, which is not the stated rule.
_Source: OpenStax Physics (CC BY 4.0), Ch 13 "Waves and Their Properties", section Wave Interference_
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