Ghosts appear when there are sound waves

British IT specialist Vic Tandy never forgot that night. He is working in a laboratory at Coventry University, England. 7 pm clock. All of the associates came back but Tandy seemed to lose his sense of time because he was completely caught up in his work.

Suddenly, he felt cold along his spine - someone was watching him. Tandy looked around and saw something unknown, hazy like fog, gray approaching him. It seemed to be moving and looked directly at Tandy. That ghost disappeared in thin air when it was less than a meter away from the researcher.

The above is just the beginning of the story that Tandy told one of the British newspapers.The rest opens like a detective film interspersed with scientific details.

As a true researcher, Tandy decided to explore this phenomenon, on a solid scientific basis. He spent five years exploring all the ghost-related stories observed in British castles, and " ambushing " at night. He also studied scientific equipment. Finally, Tandy believed that he knew where the ghosts came from, even explaining why the misty people encountered ghosts with higher frequencies than other residents.

" The ghosts in this country have many reasons to go along the corridors and towers of ancient castles and mansions because the strong sea breeze blows fast across the British islands ," Tandy said. " The winds created sound waves in a particular frequency range, which until recently researchers have not recorded. People often see the phenomenon created by these sound waves as ghosts. ".

Tandy came to this conclusion by accident. He brought a thin sword to work one day after seeing the specter in the laboratory. This sword needs to be repaired to take part in a competition that Tandy intends that weekend. He kept it in a pair of beaks and soon saw it swinging like an invisible hand pressing from front to back. The researcher believes that he is witnessing resonance.

Tandy studied the sound waves of the wind blowing through the walls of an ancient tower (Photo: ghostexperiment.co.uk)

At that time, the laboratory was very quiet. Tandy lowered the sword to measure this process with a few devices. He was really surprised to find a horrible noise filling the room right then. But all these sounds are sound waves, with frequencies below the threshold of human hearing.

It does not take long to locate the sound source: It comes from a new ventilator installed in an air conditioner. When the researcher turned off the ventilation, the sword stopped vibrating. A second later, an interesting thought came to him: "What does this phenomenon have to do with ghosts?"

The sound waves measured in the laboratory have a frequency of 18.98 Hz. It is equivalent to the movement frequency of the eyeball.

According to Tandy, the wind whirling through the walls of an ancient tower also produced sound waves in this negative zone. Sound can go through the thickest walls. While in a tower, people can hear howling winds and groaning like mad people in corridors.

"It is no coincidence that ghosts are often seen walking along the corridor when the wind blows on the walls," the researcher cited his hypothesis.

But so far, Tandy has yet to explain why "resonant sounds" create such a specific shape. In addition, it is still unclear how the reaction of sound waves when they are created by strong winds or hissing vehicles and planes.

Thuan An