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प्रश्न
Complete the following sentence:
Ultrasound is of frequency ___________.
रिकाम्या जागा भरा
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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?
Complete the following sentence:
Elephants produce ____________sound.
Name the sound of the frequency given below:
10 Hz
State the approximate speed of ultrasound in air.
Name three animals which can hear ultrasonic vibrations.
What are ultrasonic?
What does SONAR stand for?
What are infrasonic and ultrasonic sounds?
State the main components of a hearing aid.
