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"Why is a magnetic field preferred in television sets to deflect electrons when compared to a uniform electric field?" I really have no idea.. has it got anything to do with the way they deflect, where a magnetic field causes a circular path whereas an electric field just creates an arc? Thanks ;)

Heya Could someone please explain the length contraction thought experiment? So the one in my textbook says that a light clock in a train operates horizontally, but yeh I don't get how that shows length contraction Thanks :D

Heya guys Err I just did the 2007 paper, and realised I borked basically the whole K question :( So... I know K is dependant on temperature... but, when K is equal to [Products]^moles / [Reactants]^moles Do you count solids? In the answer, solid sulfur was left out from this formula. So my...