CAPE Physics Unit 2 · 2019 · Paper 1 · Question Q43

The following equation shows the disintegration of Polonium-210 to a stable isotope of lead. ^{210}_{84}\text{Po} \longrightarrow \ ^{206}_{82}\text{Pb} + \ ^{4}_{2}\text{He} + Q For the above equation, the 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}