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The minimum distance required to hear an...

The minimum distance required to hear an echo is ________

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What is the minimum distance needed for an echo?

What is the minimum distance needed for an echo?

The minimum distance required to see the objects distinctly without strain is called ________.

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. surfaces are used to focus the sound at particular point.

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  2. Elliptical surfaces are used in designing .

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  3. The minimum distance required to hear an echo is

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  4. To determine the velocity of sound in any medium is used.

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  5. When source and listener move towards each other the apparent frequenc...

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  6. When distance between source and listener decreases apparent frequency...

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  7. The average speed of sound wave in sea water is .

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  8. The loudness of normal human voice is .

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

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

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  11. The speed of sound is inversely proportional to .

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

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

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

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

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

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

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

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

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

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