In graph A, two waves are shown at a given instant. What is the number of the curve in graph B that represents the wave resulting from the superposition of the two waves in A at this instant?
A) 1
B) 2
C) 3
D) The resultant is zero for all values of x.
E) None of these represent the wave.

Question

In graph A, two waves are shown at a given instant. What is the number of the curve in graph B that represents the wave resulting from the superposition of the two waves in A at this instant?
A) 1 
B) 2 
C) 3 
D) The resultant is zero for all values of x. 
E) None of these represent the wave.

Quizplus · Accepted Answer

At the given instant, both waves have the same amplitude and are in phase, therefore they will add up constructively. The resultant wave will have an amplitude equal to the sum of the amplitudes of the two waves and will be represented by curve 3 in graph B.

In Graph A, Two Waves Are Shown at a Given