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प्रश्न
Complete the following sentence:
Ultrasound is of frequency ___________.
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उत्तर
Ultrasound is of frequency above 20 kHz.
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संबंधित प्रश्न
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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| (a) | (b) | (c) |
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