Which ocean creature is the noisiest? Detailed answer

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Which ocean creature is the noisiest? Detailed answer

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Which ocean creature is the noisiest?

Shrimp.

And although the blue whale makes the loudest sound of all individual animals in the water and on land, it is the shrimp that makes the loudest natural noise in nature.

Shrimp layer noise is the only natural noise that can "blind" a submarine's sonar, deafening the acoustics through headphones.

Being under the shrimp layer, the hydroacoustic does not hear what is happening above it, and vice versa. Audibility from under the layer of shrimp can be ensured in only one way: raise the mast through it.

The noise level produced by a crowd of shrimp reaches a deafening 246 decibels. Even though sound travels faster in water, it equates to 160 decibels in air—much louder than the sound of a jet plane taking off (140 dB) or the human threshold for pain. Some observers have given the following comparison: it is as if all the inhabitants of our planet at the same time undertook to fry bacon in a pan.

The noise comes from trillions of shrimp clicking their single "oversized" claw at the same time. Snapping shrimp, a variety of Alpheus and Synalpheus species, are found in the shallow waters of the tropics and subtropics.

The way it all happens is even more interesting than how it all sounds. In a video shot at 40 frames per second, you can clearly see that the sound occurs 000 microseconds after the claw closes. It turns out that the noise is produced not by the click of the claw, but by the bursting of the bubble - an effect known to science as "cavitation".

How does all this look? A small tubercle on one side of the claw fits into a depression on the other side. The claw closes so quickly that a trickle of water shoots out of it. At the same time, the speed of the water stream reaches 100 km / h - it is quite enough for the formation of expanding bubbles of water vapor. When the water slows down and the pressure returns to normal, the bubbles burst, producing intense heat (up to 20°C), a loud bang, and light, the latter being considered a rather rare phenomenon and called "sonic luminescence", i.e. when sound generates light.

Shrimp use their noise to stun prey, as well as to communicate and find sexual partners. In addition to disabling sonar, this harsh and intense sound leaves dents in ships' propellers.

Author: John Lloyd, John Mitchinson

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The Pain Relieving Power of Music 21.01.2019

According to research from Queen Mary University of London, surgical patients who listened to music before, during or after surgery were significantly less anxious and more satisfied with the results of the medical intervention.

The analysis included data from randomized controlled trials in which adult patients who were exposed to any genre of music before, during, or after surgery were compared with patients who received standard medical care.

Of particular interest to the investigators were post-operative pain, need for pain relief, levels of anxiety, spread of infection, rate of wound healing, financial costs, length of hospital stay, and patient satisfaction with the results of the operation. For example, the reviewers noted that one study did not examine the effects of music on infection spread, wound healing rates, and costs. Also, there were no differences in the length of stay of patients in the hospital, depending on whether they listened to music or not.

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Paul Glagiou, PhD from Bond University (Queensland, Australia) noted that listening to music is a simple procedure that does not require special financial costs, but which significantly reduces the temporary discomfort that occurs in many patients in the surgical department.

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