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The principle of echo is used in ultras...

The principle of echo is used in ____ ultrasonography.

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SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. The minimum time interval between the two sound is .

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  2. The minimum distance required to hear an echo is part of the magnitud...

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  3. The principle of echo is used in ultrasonography.

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  4. Echo is used to determine the of sound waves in any medium.

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  5. are basically curved surfaces which are used in auditoria and halls to...

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  6. is a hearing aid used by people, who have difficulty in hearing.

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  7. A is a horn-shaped device used to address a small gathering of people...

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  8. The frequency of radio waves emitted by a satellite decreases as the s...

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  9. From the frequency change, the speed and location of the aeroplanes an...

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  10. The speed of marine animals and submarines can be determined by using ...

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  11. is a branch of physics that deals with production, transmission, recep...

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  12. The vibrating bodies produce energy in the form of waves are .

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  13. Sound is produced by .

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  14. Sound can propagate through medium.

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  15. Sound that cannot be heard by the human ear is .

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  16. The distance travelled by one wave is taken as .

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  17. The velocity of sound is in gaseous medium.

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  18. As the density increases, the velocity of sound .

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  19. Velocity of sound in solids decreases as the increases.

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  20. When humidity increases, the speed of sound .

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