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प्रश्न
What are hearing aids?
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उत्तर
A hearing aid is a device which increases the loudness and intensity of the incoming sound.
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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.
Explain how do bats locate the obstacles and prey in their way.
What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
Name three animals which can hear ultrasonic vibrations.
How do bats locate their prey during a flight?
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
What are ultrasonic?
What does SONAR stand for? Where do we make use of SONAR?
Ultrasound has frequency of vibration
