CAIE A-Level Physics 23.1.1 Mass–Energy Equivalence

Practise using E = mc² to calculate the energy equivalent of a nuclear mass difference and explain whether energy is released or absorbed.

Exam points

calculate the energy equivalent of a mass using E = mc²
explain nuclear mass-energy changes by relating a mass difference to released or absorbed energy

[Maximum number: 1]

Use data from (b) to calculate the mass that is converted into energy every second in the Sun.
mass = kg

$\begin{aligned} m=\frac{E}{c^{2}} =\frac{3.83 \times 10^{26}}{3.00 \times 10^{82}} =4.26 \times 10^{9} \mathrm{~kg} \end{aligned}$

A1

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