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The U.S. Environmental Protection Agency authored a pamphlet in 1978 that suggested a correlation between low-birthweight (using the World Health Organization definition of less than 2,500 grams (88 oz)) and high sound levels, and also high rates of birth defects in places where expectant mothers are exposed to elevated sound levels, such as ...
On the other hand, some high frequencies or impulse noise (i.e., sudden loud sounds) are more challenging to counteract and may still get through, depending on the type of technology used in the ...
A passive filter is a low pass: the high frequencies are more absorbed by the object because high frequencies impose a higher pace of compression-decompression to the object. [citation needed] The high frequency harmonics of a sound are more harmful to the inner-ear. [citation needed]
As dogs hear higher frequency sounds than humans, they have a different acoustic perception of the world. [24] Sounds that seem loud to humans often emit high-frequency tones that can scare away dogs. Whistles which emit ultrasonic sound, called dog whistles, are used in dog training, as a dog will respond much better to such levels. In the ...
The frequency of baleen whale sounds can range from 10 Hz to 31 kHz, [27] and that of elephant calls from 15 Hz to 35 Hz. Both can be extremely loud (around 117 dB ), allowing communication for many kilometres, with a possible maximum range of around 10 km (6 mi) for elephants, [ 28 ] and potentially hundreds or thousands of kilometers for some ...
The risk of negative health effects from sound exposures (be it noise or music) is primarily determined by the intensity of the sound , duration of the event, and frequency of that exposure. [9] These three factors characterize the overall sound energy level that reaches a person's ears and can be used to calculate a noise dose.
The devices emit low levels of radiation, but they pose no health risks to users.
Noise pollution, or sound pollution, is the propagation of noise or sound with potential harmful effects on humans and animals.The source of outdoor noise worldwide is mainly caused by machines, transport and propagation systems.