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प्रश्न
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उत्तर
Bats make a series of twittering sound, so high pitched that human ear can not hear. These sound waves strike against the obstacles less in their path of flight and send back echoes to the bat’s ear. The echoes tell the bats, how they must turn in the air to avoid colliding with the obstacles or with one another.
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संबंधित प्रश्न
Write true or false for a given statement.
The frequency is measured in hertz.
Fill in the blank.
We can hear sounds of frequency in the range of _______
| 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 |
Select the correct alternative :
We can distinguish a shrill sound from a flat sound by its
Name the characteristic which differentiates two sounds of the same pitch and same loudness.
Which wave property determines loudness?
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting :
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called :
200 waves pass through a point in one second. Calculate the time period of wave.
A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.
What is sound? Explain with example how does sound travel in a medium.
What type of sound is produced by elephants and whales?
Sound travels in air:
Through which medium sound travels faster, iron or water? Give reason.
Describe with diagram, how compressions and rarefactions are produced.
Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?
