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When sound is reflected from a convex su...

When sound is reflected from a convex surface, the· reflected waves are __________ out and the intensity is decreased.

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When sound is reflected from a concave surface, the reflected waves are _________ and focused at a point.

Reflection of sound is called _________ .

When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.

(I) Repetition of sound produced by the reflection of sound waves from a wall is echo. (II) In a closed room, the sound is repeatedly reflected from the walls and it is heard even after the sound source is ceased, it is called reverberation? Which one is correct?

The point of incidence and the point of reflection is the __________ on the reflection surface.

Why do we need a shiny surface for reflection?

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. The speed of sound is directly proportional to the square root of the ...

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

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  3. When sound is reflected from a convex surface, the· reflected waves ar...

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  4. When sound is reflected from a concave surface, the reflected waves ar...

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  5. Many halls are designed with reflecting surfaces to required to focus...

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  6. In surfaces, sound from one focus will always be reflected to the oth...

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  7. What is persistences of hearing?

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  8. The minimum time interval between the two sound is .

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

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  10. The principle of echo is used in ultrasonography.

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

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

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

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

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

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

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

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

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

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  20. Sound is produced by .

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