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ppk
wrote...
Valued Member
On Hiatus
Posts: 3585
5 years ago
Sound vibrations with frequencies less than 20 Hz are called
A) infrasonics.
B) ultrasonics.
C) supersonics.
D) infrared.
E) megasonics.
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1 Reply
Answer accepted by topic starter
wrote...
Educator
Posts: 20786
5 years ago
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