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English Literature must be one of the hardest subjects to revise. Some subjects such as the Sciences have certain answers in black and white on a mark scheme, so it is easy to revise by yourself, doing...

Let's think of the three boxes as A, B and C.
Say we choose box A.
There is a 1 in 3 chance that our box has the prize inside, and so a 2 in 3 chance that it does not.
When a box is o...

Acoustic impedance is the density of a material multiplied by the speed of sound in the material.
Knowing these two values allows use to calculate how much of th...

A piezoelectric crystal makes use of the peizoelectric effect. This is the production of a voltage when mechanical stress is applied across the material. This occurs only in materials ...

E.g. Evaluate how would a fall in interest rates effect economic growth.Start by defining the key terms - economic growth, possibly interest rates very briefly.Draw a diagram showing Aggregate Demand shif...