Hello,
For convenience, we can say that a submarine at some depth in sea emits sound wave which refracts from the surface of the sea and is caught by a helicopter at some height above the sea. If we know the speeds of the submarine and the helicopter and the frequency of the emitted wave (and, of course, the speed of the sound in water and air), how are we going to calculate the frequency of the received wave? I know how to use the Doppler shift's formulas when the wave travels all the time in a same media. But, when it changes media, it also changes its speed. How can we account for that?
Sincerely,
Nikola
For convenience, we can say that a submarine at some depth in sea emits sound wave which refracts from the surface of the sea and is caught by a helicopter at some height above the sea. If we know the speeds of the submarine and the helicopter and the frequency of the emitted wave (and, of course, the speed of the sound in water and air), how are we going to calculate the frequency of the received wave? I know how to use the Doppler shift's formulas when the wave travels all the time in a same media. But, when it changes media, it also changes its speed. How can we account for that?
Sincerely,
Nikola