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  1. H

    help!!!please

    The first artificial radioactive substance was made by bombarding aluminium, Al 27 13 , with α-particles. This produced an unstable isotope of phosphorus, P 30 15 . What was the by-product of this reaction? A an α-particle B a β-particle C a γ-ray D a neutron Q38...
  2. H

    9709 physics paper 22. how was it and what to do with the electricity question

    i just messed up the electricity..how to find the resistance X using Kirchhoff`s law?
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