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Elliptical surfaces are used in designin...

Elliptical surfaces are used in designing ___________ .

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whispering halls
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SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. The pitch of sound depends on .

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  2. surfaces are used to focus the sound at particular point.

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  3. Elliptical surfaces are used in designing .

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  4. The minimum distance required to hear an echo is

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

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

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

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

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  9. The loudness of normal human voice is .

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

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

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  12. The speed of sound is inversely proportional to .

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

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

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

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

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

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

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

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

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