Ultrasound
Sound waves with frequencies above the human hearing range
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| July 2015 | The Economist reported on University of California, Berkeley researchers conducting ultrasound studies using graphene diaphragms, exploring potential applications like underwater communications. |
| 2010 | The UK's independent Advisory Group on Non-ionising Radiation (AGNIR) produced a report published by the UK Health Protection Agency (HPA), recommending exposure limits for airborne ultrasound sound pressure levels: 70 dB at 20 kHz and 100 dB at 25 kHz and above. |
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