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प्रश्न
Ultrasound has frequency of vibration
विकल्प
between 20 and 20,000 Hz
below 20 Hz
above 20,000 Hz
between 500 and 10,000 Hz
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उत्तर
above 20,000 Hz
Explanation:
Ultrasound has frequency of vibration above 20000 Hz.
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संबंधित प्रश्न
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
 |
 |
| I | II |
 |
 |
| III | IV |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
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Infrasonic sound is of frequency ______________.
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