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प्रश्न
What do you understand by the term ultrasonic vibrations?
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उत्तर
Those vibrations, whose frequency is more than 20000 hertz and are not perceived by human ear, are known as ultrasonic vibrations.
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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?
Name the sound of the frequency given below:
40 kHz
Sonar makes use of :
What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
What are ultrasonic? State and explain two applications of ultrasounds.
What are infrasonic and ultrasonic sounds?
What are hearing aids?
