In Figure sound waves A and B, both of wavelength , are initially in phase and traveling

In Figure sound waves A and B, both of wavelength λ, 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 λ: L = qλ. What are the

(a) Smallest and

(b) Second smallest values of q that put A and B exactly out of phase with each other after the reflections?

Transcribed Image Text:

1. L.