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Many halls are designed with reflecting...

Many halls are designed with _______ reflecting surfaces to required to focus the sound at a particular point.

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

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.

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

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

At 10^(@)C , how for away is a reflecting surface if you hear an echo in 0.274s? (speed of sound in air at 0^(@)C is 331.3ms^(-1) ).

An ultrasound signal of frequency 50 kHz is sent vertically into sea water. The signal gets reflected from the ocean bed and returns to the surface 0.80 s after it was emitted. The speed of sound in sea water is 1500ms^-1 . a) Find the depth of the sea. b) What is the wavelength of this signal in water.

A point source of monochromatic light of 1.0 mW is placed at a distance of 5.0 m from a metal surface. Light falls perpendicularly on the surface. Assume wave theory of light to hold and also that all the light falling on the circular area with radius =1.0 xx 10^-9m (which is few times the diameter of an atom) is absorbed by a single electron on the surface. Calculate the time required by the electron to receive sufficient energy to come out of the metal if the work function of the metal is 2.0eV .

Write the application of reflection of sound though the be curved surface.

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. When sound is reflected from a convex surface, the· reflected waves ar...

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

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

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

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  5. What is persistences of hearing?

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

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

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  8. The principle of echo is used in ultrasonography.

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

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

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

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

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

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

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

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

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

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  18. Sound is produced by .

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  19. Sound can propagate through medium.

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

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