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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
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.
Which has the higher frequency - ultrasonic sound or infrasonic sound?
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Elephants produce ____________sound.
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State two applications of ultrasound.
Name three animals which can hear ultrasonic vibrations.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
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What is echocardiography?
State the main components of a hearing aid.
