CAPE Physics Unit 2 · 2010 · Paper 1 · Question Q40

The equation 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}} + \Delta 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 \Delta Q?

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