The key idea
Before calculating, identify what the quantities represent, their units and the direction in which you expect the result to change. For Beta decay, this simple prediction is a useful check: it forces you to connect the symbols or vocabulary to a physical or chemical meaning.
Why it matters
Choose a concrete case linked to Beta decay. Write down the known information, what you are trying to find, and the units. Then state the rule, model or trend you will use. If a calculation is involved, keep the units visible at every line; if it is conceptual, state what changes and what remains fixed.
A picture to remember
A strong answer contains four things: the starting situation, the variable that changes, the direction or numerical result, and one check. The check can be a unit, an order of magnitude, a limiting case or a comparison with a familiar example.
Beta decay
Beta decay changes the proton-neutron balance of a nucleus through the weak interaction. In beta-minus decay a neutron becomes a proton while an electron and an antineutrino are emitted.
The key idea
Beta processes explain why a nucleus can change element without losing four nucleons as in alpha decay.
Choose a concrete case linked to Beta decay. Write down the known information, what you are trying to find, and the units. Then state the rule, model or trend you will use. If a calculation is involved, keep the units visible at every line; if it is conceptual, state what changes and what remains fixed.