Search over 10,000 free study notes

With a problem like this, the key is to split it down into component parts.

We will treat the star as a perfec...

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 yo...

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 larg...

The thermal nuclear reactor is one of many systems used to...