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    Okay so I haven't revised P3 yet but I have to do this little test for homework for tomorrow. We can use books and stuff to help us but I can't do the second half of the paper, help?!
    Thank you!
    Some questions I need help with!:
    1) suggest why a beta particle will travel further in air than an alpha particle.

    Is it because Alpha's can only go 10cm through air?

    2) some unstable nuclei decay by emitting b- radiation. Describe the process of b- emission

    2b) explain what happens to the mass number and atomic number of a nucleus when b- emission occurs

    3) an electron and a positron collide and annihilate each other. Two protons are proceed explain why two protons must be produced, rather than one



    Thank guys!
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    1) An alpha particle is much larger and has a higher charge, it will encounter more collisions than a beta particle (electron). Because an alpha particle is a helium nucleus and a beta particle is an electron.

    2) beta decay is when a neutron in the nucleus changes into a proton and emits a beta particle (an electron). Or vice-versa, proton > neutron.

    2b) The mass number stays the same because the electron emitted has negligible mass. The charge change depends on the beta decay. It is most likely to be a neutron changing into a proton for gcse so the new element will have +1 charge. So the charge increases by 1.

    3) One photon cannot be created because momentum must be conserved. Here is a better explanation:
    http://physics.stackexchange.com/que...ton-production
 
 
 
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