Definitions (AQA A-Level Physics): Flashcards

Becquerels ($Bq$), where $1 \, Bq = 1$ decay per second

Strongly ionising, low penetration (stopped by paper/air)

$1.66 \times 10^{-27}$ kg

Weakly ionising, stopped by few mm aluminium

Energy required to split nucleus into individual nucleons

Average time for half of radioactive nuclei in sample to decay

$I \propto \frac{1}{d^2}$

Difference in mass between nucleus & sum of nucleon masses

Splitting heavy nucleus into smaller nuclei, releasing energy

Joining light nuclei to form heavier nucleus, releasing energy