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प्रश्न
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.
पर्याय
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.
MCQ
विधान आणि तर्क
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उत्तर
A is false, but R is true.
Explanation:
The assertion is false: for an echo to be heard, the reflected sound must travel at least 330 × 0.1 = 33 in total. The reason is true because a reflection heard in less than 0.1 s is not heard as a separate echo.
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