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    • Thread Starter

    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!

    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:
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