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प्रश्न
What is ultrasound?
एका वाक्यात उत्तर
उत्तर
Sounds of frequency above 20 kHz are called ultrasound.
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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.
Complete the following sentence:
Elephants produce ____________sound.
Name the sound of the frequency given below:
1000 Hz
State two applications of ultrasound.
Sonar makes use of :
State four practical uses of ultrasonic vibrations.
What are ultrasonic?
Does SONAR make use of infrasonic sound?
Is the energy carried by the ultrasound very high or very low?
What are hearing aids?
