It takes 2.0 seconds for a sound wave to travel between two fixed points when the day temperature is 10oC. If the temperature rise to 30oC the sound wave travels between the same fixed parts in

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1.9 sec

2.0 sec

2.1 sec

2.2 sec

answer is A.

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Detailed Solution

Suppose the distance between two fixed points is d then t=dvalso v∝T⇒t1t2=v2v1=T2T1⇒2t2=303283⇒t2=1.9sec

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