Recent content by rachelcapt

Thank you both (seems so obvious now you've helped me simplify it!)

can someone / anyone tell me the trick to solve 501^2 - 400^2 Beginning to feel a little stupid now :blushing:

On a related topic... after getting a PhD in Britain I quickly got out of research because, unless you're lucky, you tend to be employed on short term contracts which do not always get renewed. One researcher where I used to work had been on 1 - 3 year contracts for 28 years. After gaining...

During beta decay (eg of strontium) a neutron becomes a proton and an electron. The electron then leaves the atom. The atom (yttrium) must then have one more proton than electron so does beta decay of strontium always leave IONISED yttrium?

Thanks for your replies - that sounds right. Does anyone have any figures for the scattering cross sectional areas of Cu and Fe?

I thought the thing that makes a metal more conductive is the number of free electrons... How then is copper more conductive than iron when copper has only 8.47 (x10^22) free electrons per cm cubed compared to a massive 17 for iron? If someone could explain this to me my face will go like...