![]() ![]() "What does it do to our hearing? And in return, what does it do to our brain? Certain lamps may emit these high-frequency noises," says Surajit Sen, PhD, professor of physics in the University at Buffalo College of Arts and Sciences. You have ultrasonics from machinery, from drilling. In warmer areas, you have pest control systems that are strongly reliant on ultrasonic emissions to drive out the pests. "There is a fair amount of ultrasonic stuff around us, and much of it has effects that are unknown. ![]() But some research suggests that effects could include nausea, headaches, dizziness, impaired hearing or other symptoms. The impacts of such noises on health are uncertain. In a new study, theoretical physicists report that materials made from tapered chains of spherical beads could help dampen sounds that lie at the upper range of human hearing or just beyond. ![]()
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