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Sunday, 2 October 2016

Noise

Around 600 BC, roosters and tinsmiths were banned in Sybaris, Greece because of their noise.

The scientific unit of sound intensity is the decibel. A decibel is one tenth of a Bel, which was named after telecommunications pioneer Alexander Graham Bell.

Alexander Graham Bell

One decibel (1dB) is the smallest difference in sound level the human ear can detect.

Annalisa Flanagan, a primary school teacher in Finaghy, south Belfast is listed in the Guinness Book Of Records for the loudest shout. Ironically it happened when she yelled the word "quiet" at a Citybus shouting contest in 1994, reaching an impressive 121.7 dB.

Human shouting usually registers under 90dB. A howler monkey registers about 128.

The loudest land animal is the Howler monkey whose deep growls can travel up to three miles in the forest.


The water boatman can sing with its penis. It rubs said part against its abdomen, thereby producing a sound. Such is the volume level that the insect ranks as the loudest creature in the world relative to its size.

The blue whale can produce sounds of up to 188 decibels, louder than a jet engine at take-off, and their calls have been detected 530 miles away.


However, the blue whale is not actually the loudest animal on Earth. The sperm whale is louder: its communicative clicks have been measured at 230 dB.

The loudest noise ever recorded was the eruption of the Krakatoa in 1883. The sound ruptured the ear drums of sailors 40 miles away and was heard in Australia over 2,000 miles away from the blast.

Since sound can travel through water better than it can air, the potential number of decibels is greatly increased. LFA Sonar used by ships and submarines is the loudest man made noise, reaching 200+ decibels. Marine biologists believe that sea creatures may beach themselves to escape the sound.

There is noise in space whatsoever. Physicians state that in order for the sound to emerge the sound wave needs a medium. On Earth atmosphere is the medium and that is how we hear sounds. However, there is no atmosphere in space, so no sounds can be heard.

Source Daily Express

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