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This is a common question in A-level physics and a core concept for the course.  

Fission occurs when a heavy nucleus splits into smaller, more stable nuclei, releasing energy in the proc...

This kind of question demonstrates the fact that certain problems can be expressed in much simpler ways so they be easily solved.  In this particular example the question can be simplified to "int...

i) Concentration of reactants, or pressure for gases-  As there are more particles in a certain volume, they collide more often so there is a greater chance of successful collisions per unit timeii) Press...

First of all it is important to have clear and useful notes to revise from.

Keep your school notes organised and you can write your own notes while looking back over these online sessions...

Negative feedback: occurs where the feedback causes the corrective measures to be "switched off", and in doing so returns the system to its original level.

Exam...