CAPE Physics Unit 2 · 2013 · Paper 1 · Question Q41

The equation below shows the disintegration of polonium-210 to a stable isotope of lead. {}^{210}_{84}\text{Po} \rightarrow {}^{206}_{82}\text{Pb} + {}^4_2\text{He} + Q For the above equation mass of {}^{206}_{82}\text{Pb} = 205.969\text{ u} mass of {}^4_2\text{He} = 4.004\text{ u} mass of {}^{210}_{84}\text{Po} = 209.982\text{ u} What is the mass equivalent of Q?

1. (A)1.5 \times 10^{-29}\text{ kg}
2. (B)6.7 \times 10^{-27}\text{ kg}
3. (C)3.4 \times 10^{-25}\text{ kg}
4. (D)3.5 \times 10^{-25}\text{ kg}