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प्रश्न
What is the difference between infrasonic waves and ultrasonic waves ?
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उत्तर
Difference between infrasonic and ultrasonic waves
| Infrasonic waves | Ultrasonic waves |
| These waves have frequencies below 20Hz. | These waves have frequencies above 20 kHz. |
| They are produced by objects vibrating very slowly. | They are produced by objects vibrating very rapidly. |
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संबंधित प्रश्न
What is the range of frequencies associated with infrasound?
A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s−1.
Name the organs of hearing in our body.
What name is given to the sound waves of frequency too low for humans to hear ?
What type of sound waves are produced by a vibrating simple pendulum ?
Which of the following sound frequencies cannot be heard by a human ear ?
(i) 10 Hz
(ii) 100 Hz
(iii) 10,000 Hz
(iv) 15 Hz
(v) 40,000 Hz
What are ultrasonic waves ? Name two animals which can produce ultrasonic waves.
Three different vibrating objects produce three-types of sounds X, Y and Z. Sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in hospitals to break kidney stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated.
(a) What type of sounds are (i) X (ii) Y, and (iii) Z ?
(b) Name one device which can produce sound like X.
(c) Name one device in a science laboratory which can produce sound like Y.
(d) Name one device in our homes which can produce sound like Z.
(e) What is the frequency range of sounds like Z ?
One of the following can hear infrasound. This one is :
Which of the above two graphs (a) and (b) (Fig.12.3) representing the human voice is likely to be the male voice? Give a reason for your answer.
