1. Two radar waves are emitted from two submarines. If one was moving 1km per second
toward the other, while the other was still. What is the difference wave lengths received by
subs.
speed of sound underwater 1484 m/s
answer: the speeding one would receive a wavelength of 1/2.35 the length of the original.
add double the speed for dobler effect in (movement plus, echo) to speed of sound. Since
wavelength is proportional to speed. Obtain the speed of sound and measure how much
faster it is compared to sound received by subs, then invers it.