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प्रश्न
What is the range of frequencies associated with ultrasound?
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उत्तर
Frequencies higher than 20 kHz are called ultrasonic sound or ultrasound.
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संबंधित प्रश्न
Fill in the blanks with suitable words.
A sound wave consists of places of higher pressure called ................. and places of................pressure called.................
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(i) 10,000 Hz
(ii) 30,000 Hz
(iii) 18 Hz
(iv) 50,000 Hz
(v) 10 Hz
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What is ultrasound ? What is the difference between ordinary sound and ultrasound ?
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