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Physics
Physics
Problem
Sound waves with frequency higher than ____ are termed ultrasound. a)
2
kHz
2\,\text{kHz}
2
kHz
b)
20
kHz
20\,\text{kHz}
20
kHz
c)
20
Hz
20\,\text{Hz}
20
Hz
d)
200
kHz
200\,\text{kHz}
200
kHz
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