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ppk ppk
wrote...
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Posts: 3561
12 years ago
Sound vibrations with frequencies greater than 20,000 Hz are called
A) infrasonics.
B) ultrasonics.
C) supersonics.
D) infrared.
E) megasonics.
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Answer accepted by topic starter
bio_manbio_man
wrote...
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Posts: 33224
12 years ago
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