Tikniyoolajiyadda nadiifka ah ee gariirka 'Acoustic vibration': Sonic burushka ku wareegsan 31000 oo istaroog-Ku raaxeyso ilkaha nadiifka ah ee caafimaadka qaba, xafid dhoolla caddeyntaada. Hel nadiifin dhammaystiran oo leh buuq yaraaday, oo si weyn ugu horumariso caafimaadkaaga afkaaga 14 maalmood oo keliya.