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Surface Tension — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsSurface Tension1 Mark
Question
Assertion : Mass and energy are not conserved separately, but are conserved as a single entity called mass-energy.
Reason : Mass and energy conservation can be obtained by Einstein equation for energy.
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Answer

(a) From Einstein equation $E=m c^2$it can be observed that if mass is conserved then only energy is conserved and vice versa. Thus, both cannot be treated separately.

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