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When sound is reflected from a concave s...

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

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

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.

Reflection of sound is called _________ .

What kind of surface reflects light?

An operator sitting in his base camp sends a sound signal of frequency 400 Hz. The signal is reflected back from a car moving towards him The frequency of the reflected sound is found to be 410 Hz. Find the speed of the car. Speed of sound in air = 324 m s^-1 .

The wavelength of sound waves ranges from __________ .

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. Velocity of sound in solids decreases as the increases.

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

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

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

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

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  6. What is persistences of hearing?

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

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

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  9. The principle of echo is used in ultrasonography.

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

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

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

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

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

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

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

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

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

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  19. Sound is produced by .

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  20. Sound can propagate through medium.

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