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?
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
Related Questions
Figure shows a mixed source R of alpha and beta particles in a thick lead walled container. The particles pass through a magnetic field in a direction perpendicular to the plane of paper inwards as shown by x.
(a) Show in the diagram how the particles get affected.
(b) Name the law used in part (a)
What is nucleus of an atom? Compare it's size with that of the atom. Name it's constituents. How is the number of these constituents determined by the atomic number and mass number of an atom?
A radioactive source emits three types of radiations.
(a) Name the three radiations.
(b) Name the radiations which are deflected by the electric field.
(c) Name the radiation which is most penetrating.
(d) Name the radiation which travels with the speed of light.
(e) Name the radiation which has the highest ionizing power.
(f) Name the radiation consisting of the same kind of particles as the cathode rays.
The diagram in figure shows a radioactive source S placed in a thick lead walled container. The radiations given out are allowed to pass through a magnetic field. The magnetic field (shown as x) acts perpendicular to the plane of paper inwards. Arrows show the paths of the radiations A, B and C.
(a) Name the radiations labelled A, B and C.
(b) Explain clearly how you used the diagram to arrive at the answer in part (a).