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A perpendicular line drawn at the point ...

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

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The lines having frequencies higher than the incident frequency is called ___________ lines.

The lines having frequencies lower than the incident frequency is called ___________ lines.

Three mutually perpendicular lines are drawn from the point (1,2,-1) . If one of the lines is perpendicular to the x-axis and the direction ratios of the second line are (1,2,-1) then which are the possible equation(s) of the third line

The spectral lines having frequency equal to the incident ray frequency is called _________ .

Equation of the straight line perpendicular to the line x-y+5=0, through the point of intersection the y-axis and the given line

The spectral lines which are having frequences other than the incident ray frequency are called ____________ .

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

SURA PUBLICATION-ACOUSTICS-ADDITIONAL QUESTIONS & ANSWERS (FILL IN THE BLANKS (COVERS THE WHOLE UNITS))
  1. Sound waves that travel towards the reflecting surface are called the ...

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

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

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

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

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

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  7. Full form of RADAR .

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  8. Expansion of SONAR .

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

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

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

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

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

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

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

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

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  17. Rarefaction travels from to .

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

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

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  20. waves with frequency greater than 20 kHz.

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