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The colour of the sky comes from sunlight scattering off of the air molecules (and to your eyes). Blue light gets scattered more than red light because it has a shorter wavelength, and so the light you see w...

v = u+at u=v-at u=10 - (4*2) u=2

The half-life of a radioactive isotope is the time taken for half of the atoms in a given sample of the isotope to decay. Radioactivity is random and so, half-life is the average time taken for a large numbe...

The thermal nuclear reactor is one of many systems used to produce energy (electricity). Like many systems (furnaces for example) it does this by heating water to produce steam. This steam drives turbines wh...

Maxwell's equations in free space: ∇ . E = 0 ∇ x E = - ∂ B/ ∂ t ∇ . B = 0 ∇ x B = (1/c 2 )( ∂E / ∂ t) The wave equation: ∇ 2 U = (1/c 2 ) ( ∂ 2 U / ∂ t 2 ) If we take the curl of ∇ x E , we get ∇ x( ∇ x E ) ...