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Two copper spheres of the same external ...

Two copper spheres of the same external radius, one solid but the other hollow, are heated up to a certain temperature and then are allowed to cool under similar condition. Which sphere will cool faster ?

Text Solution

Verified by Experts

The hollow sphere will cool faster.
As both are made of copper, the specific heat s is the same.
Now, H = mst, or `t=(H)/(ms),` where t = rate of fall temperature. As the mass of the hollow sphere is less, t will be higher for it. So it will cool faster.
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