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The sound is carried by waves, known as whispering-gallery waves, that travel around the circumference clinging to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. [1] The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. [2]
Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface.Originally discovered for sound waves in the whispering gallery of St Paul's Cathedral, they can exist for light and for other waves, with important applications in nondestructive testing, lasing, cooling and sensing, as well as in astronomy.
A person standing at the focus of one can hear another person speaking in a whisper at the focus of the other, despite the wide separation between them. Parabolic microphones depend on a parabolic dish to reflect sound coming from a specific direction into the microphone placed at the focus. They are extremely directional: sensitive to sounds ...
Additionally, the tuning fork is placed on the forehead. The patient is then asked if the sound is localised in the centre of the head or whether it is louder in either ear. If there is conductive hearing loss, it is likely to be louder in the affected ear; if there is sensorineural hearing loss, it will be quieter in the affected ear. This ...
Interpreters have to be in the venue and it tends to get quite noisy. Having in mind the stress the interpreters have to endure during big conferences, it is very important to ensure they have a sound-proof working environment – that is, interpreter booths. Interpreter booths can be either permanent or mobile.
360-degree image of an acoustic anechoic chamber 360-degree image of an electromagnetic anechoic chamber. An anechoic chamber (an-echoic meaning "non-reflective" or "without echoes") is a room designed to stop reflections or echoes of either sound or electromagnetic waves.
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