AP EAMCET · PHYSICS · Thermal Properties of Matter
Two metallic spheres \(P\) and \(Q\) are made of same material have same smoothness but the weight of \(P\) is 8 times that of \(Q\). If the two are heated to same temperature and left to cool, then the ratio of rate of cooling of \(Q\) to that of \(P\) is
- A 4
- B 8
- C 2
- D 1
Answer & Solution
Correct Answer
(C) 2
Step-by-step Solution
Detailed explanation
Given, weight of material \(P\) is 8 times the weight of material \(Q\). i.e., \(\quad m_p=8 m_Q\) From stefan's law, the rate of heat radiation from an object is given by \(\frac{\Delta Q}{\Delta t}=e \sigma A T^4\)...(i) where, \(e=\) emissivity, \(\sigma=\) Stefan's constant…
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