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Acoustic mirror: Quiz


Question 1: Microphones placed at the foci of the reflectors enabled a listener to detect the sound of aircraft far out over the ________.
Baltic SeaCeltic SeaEnglish ChannelNorth Sea

Question 2: The Dungeness mirrors, known colloquially as the "listening ears", consist of three large ________ reflectors built in the 1920s–1930s.

Question 3: The most famous of these devices still stand at Denge on the Dungeness peninsula and at Hythe in ________.

Question 4: Prior to World War II and the invention of radar, acoustic mirrors were built as early warning devices around the coasts of ________, with the aim of detecting airborne invasions.
ScotlandGreat BritainUnited KingdomEngland

Question 5: Other examples exist in other parts of Britain (including Sunderland, Redcar, Boulby, Kilnsea) and Selsey Bill, and Bahar ic-Caghaq in ________.
MaltaCyprusUnited StatesPhilippines

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