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प्रश्न
उत्तर
Velocity of sound = `"distance travelled"/"time taken" = (2"d")/"t"`
t = `(2"d")/"v" = (2 xx 660)/330` = 4s
Thus, the girl hears the echo after 4s.
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संबंधित प्रश्न
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
| 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 are ultrasonics? Can you hear the ultrasonic sound?
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
Are sound waves longitudinal or transverse?
Which one of the following does not consist of transverse waves?
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
Arrange the speeds of sound in gases, solids, and liquids in ascending order.
How is sound produced?
