Physics
A radioactive source emits three type of radiations.
(a) Name the radiation of zero mass.
(b) Name the radiation which has the lowest ionising power.
(c) Name the radiation which has the lowest penetrating power.
(d) Give the charge and mass of particles composing the radiation in part (c).
(e) When the particle referred to in part (c) becomes neutral, it is found to be the atom of a rare gas. Name this rare gas and draw a model of it's neutral atom.
(f) From which part of the atom do these radiations come?
Radioactivity
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Answer
(a) The radiation of zero mass are γ radiation.
(b) The radiation which has the lowest ionising power is the γ radiation.
(c) The radiation which has the lowest penetrating power is the α radiation.
(d) α particles have a charge of +3.2 × 10-19 C (twice the charge of a proton) and rest mass of 6.68 × 10-27 kg (four times the mass of proton)
(e) When α particles become neutral, it is found to be the atom of Helium gas. Below is the model of its neutral atom:
(f) The radiations come from the nucleus of the atom
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