The mass of Radium atom decreases by 8.6 x 10^-3 kg, mass defect equivalent to energy is:
Correct answer: B. 4.84 MeV
- A. 4.48 MeV
- B. 4.84 MeV
- C. 3 x 10^2 MeV
- D. 4.84 eV
Explanation
Mass defect multiplied by square of speed is equal to the energy (E). You are given themass defect and you know the speed of light so just give it a shot ! And you'll get your answer as 4.84 MeV.E=mc2; where m = 8.6 x 10-3 kgE= 7.74 x 1014 J or 4.84 MeV
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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