Question: Radium is a radioactive element whose nucleus emits on alpha particle ( a helium nuclues ) that has a kinetic energy of about 7 .

Radium is a radioactive element whose nucleus emits on alpha particle (a helium nuclues) that has a kinetic energy of about 7.4 x 10^-13 J (4.6 MeV). To what amoutn of mass is this energy equivalvent?

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