Question

6. [4pt]
See section 17.5 in your textbook.
A harbour is shaped as shown in Fig. 1. Waves from the ocean can travel to B by paths A or C.
When path C is blocked, waves coming via A cause the water height at B to vary in time as shown in the graph below:



Consider five different situations where path A is blocked and waves coming via C cause the water height at B to vary as shown below:

Wave Height 1 (cm) -1 5 time(sec)

1)
2)
3)	Wave Height 1 (cm) -1 5 time(sec)
4)
5)

1. 
   
2. What happens in each case when both paths are open?
   
   
   If maximum Constructive interference occurs, enter C.
   
   If maximum Destructive interference occurs (zero amplitude), enter D.
   
   If Neither occurs, enter N.
   
   
   E.g., if graph 1 gives constructive interference, graph 2 gives destructive interference, and the remaining graphs give neither, enter CDNNN.

Answer 1

Ans

When both are open the waves will interfere.

1) If we superimpose waves coming along A and waves coming from C from the situation(graph) 1. We can see the two waves are out of phase by 180 degrees, so the superimposition results in maximum destructive interference.

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3) If we superimpose waves coming along A and waves coming from C from the situation(graph) 2. We can see the two waves are in phase, so the superimposition produces maximum constructive interference.

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The superposition of waves from A and graphs 2,4 and 5 do not superimpose to produce maximum constructive and/or maximum destructive interference.

The answer is

DNCNN