A possible reason for the appearance of the ghosts are sound waves

The computer specialist Vick Tandy made the assumption that the reason for the emergence of the ghosts are sound waves frequency 18,98 Hz.

One evening he was still in his lab at the University of Coventry (England). Suddenly he felt that he was someone watching. I looked around and saw him gradually approaching something gray, vague and shapeless. It moved and looked right at him. But suddenly, just two feet away from the wick, as if melted in the air. In the laboratory this time was very quiet. Tandy took measurements using various instruments. His surprise knew no bounds when he found that in the laboratory the silence really was a hell of a noise and a roar, just at lower frequencies than they are able to perceive the human ear is in the infrasonic range. After some searching, Tandy found that the source of the noise turned out to be a new fan, recently installed in the air conditioning system. Then he came up with the idea: "what if infrasound is relevant to the ghosts?"

In nature too, there are sounds in the infrasonic range of waves, if strong gusts of wind hit, for example, on the walls of old towers.

Translated by «Yandex.Translator»