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Activation energy is the amount of energy that the reactants need in order to react and become the products. For example, when burning natural gas (also called methane, or CH 4 ), you need a spark to light i...

Alfieri is the narrator, and the form of this narration is modelled on the chorus in a Greek tragedy. In Greek tragedy, the chorus was a group of performers who commented on the thoughts and actions of the p...

Throughout this extract, Bronte uses a series of techniques to present Jane as a strong female character, including a list of rhetorical questions, strong verb choices and exclamations. Bronte also presents ...

The Doppler effect describes the changes in a wave's frequency (or wavelength) as the source of the wave moves towards/ away from the observer (you). You have almost definitely experienced this phenomenon be...

The ratio 4:5:7 is a way of comparing the size of the shares received by Frank, Mary and Seth. It helps to pretend that we are sharing the sweets between some equally-sized boxes: each box has the same numbe...