+3 votes
in Class 12 by kratos

Water is cooled to form ice. If mass-energy equivalence is taken into account, this should cause the mass of water to

(a) increase

(b) decrease

(c) remain unchanged

(d) first increase, then decrease

1 Answer

+2 votes
by kratos
 
Best answer

The correct option is (b) decrease.

Explanation:

When water is cooled energy is given out as latent heat. If E is the energy thus given out, then by Einstein * equation. E = mc2there should be a reduction in the mass given by Δm=E/c2 of course, this will be too small to notice.

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