The diagram shows a mass spectrometer used for measuring the masses of isotopes. It consists of an ion generator and accelerator, a velocity selector and an ion separator, all in a vacuum. In one experiment, tin ions, each of which carries a charge +1.6 × 10-19C, are produced in the ion generator and are then accelerated by a p.d. of 20kV. Tin has a number of isotopes, two of which are tin-118 (118Sn) and tin-120 (120Sn). (c.) After selection, the ions are separated using a magnetic field on its own, as shown in the diagram. (i.) Name the trajectory of the ions in the ion separator. Explain your answer. (ii.) Show that the radius of the trajectory is directly proportional to the mass of the ion. (iii.) On the ion separator, draw the trajectories of the two isotopes of tin till they strike the photographic plate P. Label your diagram. Explain why they strike the plates at different points.
The diagram shows a mass spectrometer used for measuring the masses of isotopes. It consists of an ion generator and accelerator, a velocity selector and an ion separator, all in a vacuum.
In one experiment, tin ions, each of which carries a charge +1.6 × 10-19C, are produced in the ion generator and are then accelerated by a p.d. of 20kV. Tin has a number of isotopes, two of which are tin-118 (118Sn) and tin-120 (120Sn).
(c.) After selection, the ions are separated using a magnetic field on its own, as shown in the diagram.
(i.) Name the trajectory of the ions in the ion separator. Explain your answer.
(ii.) Show that the radius of the trajectory is directly proportional to the mass of the ion.
(iii.) On the ion separator, draw the trajectories of the two isotopes of tin till
they strike the photographic plate P. Label your diagram.
Explain why they strike the plates at different points.
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