In Fig., sound waves A and B, both of wavelength lamda , are initially in phase and traveling rightward, as indicated by the two rays. Wave A is reflected from four surfaces but ends up traveling in its original direction. Wave B ends in that direction after reflecting from two surfaces. Let distance L in the figure be expressed as a multiple q of lamda: L = q lamda. What are the (a) smallest and (b) third smallest values of q that put A and B exactly out of phase with each other after the reflections?

In Fig., sound waves A and B, both of wavelength lamda , are initially

1.	In Fig., sound waves A and B, both of wavelength lamda , are initially in phase and traveling rightward, as indicated by the two rays. Wave A is reflected from four surfaces but ends up traveling in its original direction. Wave B ends in that direction after reflecting from two surfaces. Let distance L in the figure be expressed as a multiple q of lamda: L = q lamda. What are the (a) smallest and (b) third smallest values of q that put A and B exactly out of phase with each other after the reflections?
Answer» SOLUTION :(a) 0.5 , (B) 2.5

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