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An alpha particle is made up of two neutrons and two protons. It is the same as the nucleus of a helium atom.

To find the maximum/minimum of a curve you must first differentiate the function and then equate it to zero. This gives you one coordinate. To find the other you must resubstitute the one already found into ...

If a reaction is exothermic, it means that it gives out energy, heating up its surroundings, and so the products have less energy than the reactants. If a reaction is endothermic, it means that it takes in e...

Using "vous" shows respect towards elder people or people one meets for the first time. It is used for example with teachers, higher ranked colleagues and salesmen. "Tu" is used between m...

To differentiate y=(x 2 +4x) 5 you need to use the chain rule. The chain rule uses the fact that dy/dx = dy/dt * dt/dx. Here we create a new variable t, where t = x 2 +4x. Substituting this in the original e...