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प्रश्न
Complete the following sentence:
Infrasonic sound is of frequency ______________.
उत्तर
Infrasonic sound is of frequency below 20 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.
Which has the higher frequency - ultrasonic sound or infrasonic sound?
State the approximate speed of ultrasound in air.
Explain how do bats locate the obstacles and prey in their way.
What is Galton’s whistle? To what use is it put?
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 infrasonic and ultrasonic sounds?
State the main components of a hearing aid.
State the properties of ultrasound that make it useful.
