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A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...
Subterranean rumbling is a phenomenon in which the ground vibrates and makes sounds due to an earthquake. During earthquakes or volcanic eruptions , the ground vibrates, sometimes creating short-period seismic wave motion ( ground motion ) that reaches the air and becomes sounds ( sound waves ), and low sounds can be heard.
Room acoustics is a subfield of acoustics dealing with the behaviour of sound in enclosed or partially-enclosed spaces. The architectural details of a room influences the behaviour of sound waves within it, with the effects varying by frequency .
The O'Donnells were working to brace their two-acre apple orchard in Oak Glen against the storm when they heard what sounded "like a train was coming through."
Output of a computer model of underwater acoustic propagation in a simplified ocean environment. A seafloor map produced by multibeam sonar. Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries.
Solar heat is clean and renewable. This is the most modern system. Increasingly, solar powered water heaters are being used. Their solar thermal collectors are installed outside dwellings, typically on the roof or walls or nearby, and the potable hot water storage tank is typically a pre-existing or new conventional water heater, or a water heater specifically designed for solar thermal.
An 80 US gal (300 L; 67 imp gal) electric storage tank water heater was able to have a minimum energy factor of 86% under the pre-2015 standard, while under the 2015 standard, the minimum energy factor for an 80-gallon electric storage tank water heater is now 197%, which is only possible with heat pump technology. This rating measures ...
In German folklore and ghostlore, a poltergeist (/ ˈ p oʊ l t ər ˌ ɡ aɪ s t / or / ˈ p ɒ l t ər ˌ ɡ aɪ s t /; German: [ˈpɔltɐɡaɪ̯st] ⓘ; ' rumbling ghost ' or ' noisy spirit ') is a type of ghost or spirit that is responsible for physical disturbances, such as loud noises and objects being moved or destroyed.
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