Exam-style question
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If a particle has a mass of 9.1 x 10^-31 kg, what is its energy equivalent using E = mc^2?.
- A.8.19 x 10^-14 J
- B.1.63 x 10^-13 J
- C.2.73 x 10^-14 J
- D.1.36 x 10^-13 J
Model answer
What a good answer should say
- 8.19 x 10^-14 J
Explanation
Why this works
Using the formula E = mc^2, where m is the mass (9.1 x 10^-31 kg) and c is the speed of light (3 x 10^8 m/s), we substitute: E = (9.1 x 10^-31 kg)(3 x 10^8 m/s)^2 = 8.19 x 10^-14 J.
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