Sonic Attacks' in China could just be ultrasonic surveillance

The transcript discusses fears of sonic weapons due to abnormal sensations of sound and pressure. Researchers from the University of Maryland theorize that illnesses may result from surveillance gear being too close together. Ultrasonic devices can interfere with each other, causing intermodulation distortion, which produces audible sounds similar to those reported by patients. These devices can also cause cavitation damage by forming bubbles in body fluids, tissues, or cells.

What was the initial concern that led researchers to investigate the symptoms experienced by individuals?

• A new type of virus

• A Sonic weapon

• A natural disaster

• A chemical spill

What hypothesis did the University of Maryland researchers propose regarding the cause of the symptoms?

• A natural disaster

• A chemical reaction

• Surveillance gear placed too closely

• A new type of virus

What phenomenon occurs when ultrasonic devices interfere with each other?

• Cavitation

• Intermodulation distortion

• Resonance

• Echoing

What can ultrasonic devices produce when they interfere with each other?

• Visible light

• Audible sounds

• Magnetic fields

• Electric currents

What type of damage can ultrasonic devices cause in body tissues?

• Thermal damage

• Electrical damage

• Cavitation damage

• Chemical damage