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The minimum distance required to hear an...

The minimum distance required to hear an echo is I/20th part of the magnitude of velocity of sound in air, if the velocity of sound is _________ then the minimum distance required to hear an echo is 17 .2 m.

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`344 ms^(-1)`
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The minimum distance required to hear an echo is ________ part of the magnitude of the velocity of sound in air.

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To hear a distinct echo, each time interval between the original sound and the reflected sound must be __________ .

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. The average speed of sound wave in sea water is .

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  2. The loudness of normal human voice is .

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  3. The minimum distance required to hear an echo is I/20th part of the ma...

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  4. The velocity of sound increases when the of the material increases.

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  5. The speed of sound is inversely proportional to .

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  6. The of sound in a gas increases with the increase in temperature.

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  7. The velocity of sound changes by when the temperature changes by 1^@C...

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  8. The angle of incidence is equal to the angle of .

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  9. The and refraction of sound is similar to the reflection of light.

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  10. Sound waves that travel towards the reflecting surface are called the ...

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  11. The point of incidence and the point of reflection is the on the refl...

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  12. A perpendicular line drawn at the point of incidence is called the .

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  13. In ear trumpet, the sound enters into the with more intensity.

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  14. The apparent change in frequency first observed and explained by .

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  15. An is emitted by a source attached to a police car.

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  16. Full form of RADAR .

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  17. Expansion of SONAR .

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  18. is the frequency of the sound as heard by the listener.

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  19. The product of the time period of a wave and its frequency is .

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  20. In ordinary talk, amplitude of vibration is approximately .

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