Question 1

Can we convert all mass to energy?

Accepted Answer

In practice, only a small fraction of mass is converted. Nuclear fission converts about 0.1% of mass to energy. Matter-antimatter annihilation converts 100% but requires antimatter.

Question 2

What is c in E=mc²?

Accepted Answer

c is the speed of light in vacuum: 299,792,458 m/s (about 300,000 km/s). It’s a fundamental constant of the universe.

Mass-Energy Equivalence

f(x)Calculatrice Interactive

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