Physicist Maurice
Ewing was tasked with the problem of how to locate World War 2 pilots who ditch
in the middle of the Pacific Ocean.
His solution, the SOFAR
sphere was simple and ingenious.
When pilots ditched they were
instructed not to use the radio, because the enemy may locate them, but to drop
a hollow metal sphere into the ocean and wait.
How the SOFAR sphere works is
explained beautifully in a very interesting physics video lecture. The
explanation is within the grasp of A-level physics students, involving only familiar
concepts such as refraction, pressure and wave motion. And it is delivered
superbly in a style that will or, more
realistically, may engross even the most reluctant A-level physics student.
The full lecture can be seen
at http://bit.ly/hwFYyg or if you’re inside Physics-online.com just search “sofar”