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प्रश्न
Name three animals which can hear ultrasonic vibrations.
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उत्तर
Certain creatures like dogs, bats, dolphins, and mosquitoes can detect the waves.
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संबंधित प्रश्न
Fill in the blank.
The number of times a body vibrates in one second is called its ______.
| Column A | Column B |
| (a) Vibrations cause | (1) absorb sound |
| (b) A shriller sound is | (2) second |
| (c) Unit of frequency | (3) sound |
| (d) Unit of time period | (4) of high pitch |
| (e) Curtains | (5) hertz |
What do you mean by a vibratory motion?
Why are musical instruments provided with more than one string ?
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
What is sound? What causes it to produce?
A medium is necessary for ______ of sound.
A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.
