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sowdharmendiran devapal
's Polls
what is ultrasonic sound?
the answer should be in frequency .
any sound with a wave length of 20 c/s
1 vote (16%)
any sound with a wave length of 20 c/s
any thing with greater than 20000 c/s
2 votes (33%)
any thing with greater than 20000 c/s
any thing between the above two
3 votes (50%)
any thing between the above two
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6 votes
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(200 symbols max)
Wolmal
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