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A Primary key is a field in a database that is used as an unique identifier for each record. Therefore the field that is chosen as the primary key has to be something that will be different for every reco...

There are three possible emissions from a nucleus decaying radioactively. The first is the emission of an alpha particle. Alpha particles consist of neutrons and protons. Secondly a beta particle can be r...

Hobbes argues that in a ‘state of nature’, individuals are not subject to a common higher authority; instead they are free to follow their desires and act upon their own private judgement. We all have a n...

Alpha - it is composed of 2 protons and 2 neutrons. It has an identical structure to a helium nucleus (an atom with no orbiting electrons). It has an over charge of +2. It cannot pass though a sheet of ...

When working out unit equivalences the most straightforward approach is to use formulas (often in the data booklet) to help reach a correct answer. We start by looking at Joules; knowing a Joule is a unit...