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प्रश्न
What do you understand by the term infrasonic vibrations?
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उत्तर
Infrasonic vibrations: Those vibrations whose frequency is less than 20 hertz are known as infrasonic 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.
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Name the sound of the frequency given below:
10 Hz
Name the sound of the frequency given below:
100 Hz
What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
State four practical uses of ultrasonic vibrations.
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
What are ultrasonic?
State the main components of a hearing aid.
