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The apparent change in frequency first o...

The apparent change in frequency first observed and explained by__________ .

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Christian Doppler
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SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. A perpendicular line drawn at the point of incidence is called the .

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

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

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

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  5. Full form of RADAR .

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  6. Expansion of SONAR .

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  7. is the frequency of the sound as heard by the listener.

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  8. The product of the time period of a wave and its frequency is .

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  9. In ordinary talk, amplitude of vibration is approximately .

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  10. If the time period of a wave increases then its frequency will .

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  11. In a whispering hall, the speech of a person standing in one focus can...

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  12. The angle which the incident sound wave makes with the normal is calle...

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  13. The angle formed between the reflected ray and the normal is ------.

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  14. A compression travelling towards the rigid wall is reflected back as a

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  15. Rarefaction travels from to .

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  16. waves are sound waves with frequency below 20 Hz.

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  17. Waves produced during an earthquake and ocean waves are called waves.

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  18. waves with frequency greater than 20 kHz.

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  19. Human ear cannot detect waves.

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  20. Bats can detect waves.

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