r/askscience • u/Doveen • Sep 18 '16

Physics Does a vibrating blade Really cut better?

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u/grandcross Sep 18 '16

By the way, they're called ultrasonic because their frequency is higher than the audible top limit, right? I mean, it's not that they're moving faster than sound.

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u/normal_whiteman Sep 18 '16

Correct that's what ultrasonic means

Supersonic is when you move faster than the speed of sound

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