The frequency of ultrasound wave is typically?
The frequency of ultrasound wave is typically?
A. Above 20 kHz
B. Above 20,000 kHz
C. Below 20 kHz
D. Below 02 kHz
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What are considered the building blocks of matter?
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B. Luminous intensity
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B. Sodium
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Intensity of gravitational field of earth is maximum at?
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