Problem 1. Two stationary submarines communicate using sound waves of wavelength ?. They are both at
depth h = ? below the ocean surface and separated by a horizontal distance d (d>?). Sub 1 sends a sonar
signal to sub 2. Sub 2 receives a superposition of the signal that travels directly to it and a reflection from the
ocean surface (assume no phase shift upon reflection).
a) If the interfering signals produce an intensity minimum, show that the distance between the subs is
d = (15/4)?.
b) Starting with the separation distance equal to that found in a), sub 1 moves to the left and stops when sub 2
first reports a maximum intensity for the interfering signals. How far did sub 1 move?
