An underwater transmitter uses an acoustic speaker pointed upward to the surface. The transmitter sends sound signals, which travel as pressure waves. When these waves hit the surface, they cause tiny vibrations. Above the water, a radar continuously bounces a radio signal off the water surface.
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Acoustic systems called underwater telephones have been developed for this purpose. U.S. Navy submarines use a specialized telephone system to communicate underwater. It works much like an AM radio, except that it transmits and receives sound waves instead of transmitting and receiving radio waves.
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Acoustic systems called underwater telephones have been developed for this purpose.
U.S. Navy submarines use a specialized telephone system to communicate underwater.
It works much like an AM radio, except that it transmits and receives sound waves instead of transmitting and receiving radio waves.
U.S. Navy submarines use a specialized telephone system to communicate underwater.
It works much like an AM radio, except that it transmits and receives sound waves instead of transmitting and receiving radio waves.
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