Physics
The diagram shows the magnificent dome at Gol Ghumbaz at Bijapur. A boy standing at A whispers, and it is clearly heard at B across the huge dome.
[Speed of sound is 330 ms-1]
Assertion (A) : The distance travelled by sound waves (x+y) should be < 33 m.
Reason (R) : Sound reflected within 0.1 s is not heard by humans.
- A and R are true, and R is the reason for A.
- A and R are true, and R is not the reason for A.
- A is true, but R is false.
- A is false, but R is true.
Sound
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Answer
A is false, but R is true.
Explanation :
Assertion (A) is false: to hear reflected sound.
Minimum distance (d) = 16.5 m
2d = x + y
So x + y ≥ 33 m, to hear the reflected sound.
Reason (R) is true: For humans to distinctly hear reflected sound must reach the ears at least 0.1 second after the original sound.
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