17-12-2020
Physics

contestada

Ultrasound is:

a
of lower frequency than the human ear can detect.

b
the speed at which the latest, top-secret jet aircraft fly.

c
used to make internal images of the human body.

d
extremely painful to the human ear.

Respuesta :

17-12-2020

Answer:

C

Explanation:

not A as those are frequency higher than what human can hear

b is a joke

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