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URIDON81

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Two isotopes of carbon, carbon-12 and carbon-13, have masses of 19.93 10-27 kg and 21.59 10-27 kg, respectively. These two isotopes are singly ionized (+e) and each is given a speed of 7.00 105 m/s. The ions then enter the bending region of a mass spectrometer where the magnetic field is 0.6600 T. Determine the spatial separation between the two isotopes after they have traveled through a half-circle.

I have been using the equation r=mv/eB but I think that I may be inputting the incorrect value for e since all the other variables are given.