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When distance between source and listene...

When distance between source and listener decreases apparent frequency become __________ than the actual frequency.

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When source and listener move towards each other the apparent frequency is _________ than actual frequency.

At what velocity should a source of sound move towards a listener so that apparent frequency is twice the actual frequency?

The frequency of a radar is 780 MHz. When it is reflected from an approaching aeroplane the opponent frequency is more than the actual frequency by 2.6 kHz. The speed of the aeroplane is ……………. .

A whistle of frequency 540 Hz rotates in a circle of radius 2 m at an angular speed of 15rads^(-1) . What is the lowest and highest frequency heard by a listener a long distance away at rest with respect to centre of the circle ? Can the apparent frequecny be ever equal to the actual frequency? Take V=330ms^(-1) .

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. To determine the velocity of sound in any medium is used.

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

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

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

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  5. The loudness of normal human voice is .

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

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

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  8. The speed of sound is inversely proportional to .

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

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

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

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

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

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

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

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

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  17. The apparent change in frequency first observed and explained by .

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  18. An is emitted by a source attached to a police car.

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  19. Full form of RADAR .

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  20. Expansion of SONAR .

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