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प्रश्न
What are the ultrasonic waves?
एका वाक्यात उत्तर
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उत्तर
The sound wave of frequency higher than 20,000 Hz are called ultrasonic waves.
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संबंधित प्रश्न
Fill in the blank.
We can hear sounds of frequency in the range of _______
| Column A | Column B |
| (a) Vibrations cause | (1) absorb sound |
| (b) A shriller sound is | (2) second |
| (c) Unit of frequency | (3) sound |
| (d) Unit of time period | (4) of high pitch |
| (e) Curtains | (5) hertz |
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