
Heat capacity of body 1 :

Heat capacity of body 2 :

it's given that, the the head capacities of both the objects are equal. I.e


Now, consider specific heat of composite body be s'
According to given relation :



[ since,
]




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Answer:71 dB
Explanation:
Given
sound Level 
distance 
From sound Intensity





we know Intensity 




Sound level corresponding to 



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