Chapter 26, Problem 2MCP

Two sources of waves are at A and B in Figure 26.39 At point P, the path difference for waves from these two sources is

Figure 26.39

Multiple-Choice Problem 1.

1. A.    x + y.
2. B.     $\frac{x+y}{2}$.
3. C.     x − y.
4. D.    $\frac{x-y}{2}$

2. If the sources A and B in the previous problem are emitting waves of wavelength λ that are in phase with each other, constructive interference will occur at point P if (there may be more than one correct choice)

A. x = y.

B. x + y = λ.

C. x - y = 2λ.

D. x - y = 5λ.