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प्रश्न
What is ultrasound ? What is the difference between ordinary sound and ultrasound ?
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उत्तर
Ultrasound waves are high-frequency sound waves. Due to higher frequency, they can penetrate into matter to a large extent.
We can differentiate between ordinary and ultrasonic waves as :
| Audible sound waves | Ultrasound waves |
| They have a frequency range of 20 Hz–20,000 Hz | They have frequencies above 20,000 Hz |
| These sounds are audible to human ears. | These sounds are inaudible to human ears. |
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संबंधित प्रश्न
What is the range of frequencies associated with infrasound?
What is the range of frequencies associated with ultrasound?
Fill in the blanks with suitable words.
A sound wave consists of places of higher pressure called ................. and places of................pressure called.................
Name the organs of hearing in our body.
Can we hear (a) infrasonic waves (b) ultrasonic waves ?
What name is given to the sound waves of frequency too low for humans to hear ?
What is the difference between infrasonic waves and ultrasonic waves ?
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 infrasonic waves ? Name two animals which produce infrasonic waves.
A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it, there is a building adjoining the park and on the right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.
