6. Mass spectrometry uses magnetic field to separate isotopes (same element, but different atomic masses), so we can get the relative abundance of the different isotopes of a given element. For example, Chlorine has two naturally occurring isotopes: Cl-35 has a mass of 5.812 × 10- kg and Cl-37 has a mass of 6.144 x 10- kg. If both of these are ionized to a singly charged ion (q = -1.602 × 10-" C), and accelerated through a voltage of 400 V, (a) what is the diameter of the semicircular path travelled by each of the isotopes in a uniform magnetic field of 0.10 T? See the figure below for the geometry. lonizer (b) The results can be further refined by a velocity selector so only ions with a specific velocity enters the magnetic field (see below). If the electric field in the velocity selector is 2000 N/C, what magnetic field strength is needed to have only ions with speed of 4.60 × 10ʻ m/s to pass through undeflected? In that case, what is the diameter of the semicircular path travelled by each of the isotopes in a 0.10 T magnetic field? + ++ + + ++ + + + + + ®B® -> 8个8

10. What prevents gravity from pulling you through the ground to the center of Earth? Choose the best answer. A. The positive nuclei of your body's atoms repel the positive nuclei of the atoms of the ground. B. The density of the ground is greater than the density of your body. C. Atoms are bound together by chemical bonds. D. Electrons on the ground's surface and the surface of your feet repel one another.

Help with these problems

1. The equation q = ne tells us that charge is quantized in the form of small packets. Note that q is charge in coulomb (C), e is the charge of the electron, and n is the number of electrons. Using this equation, calculate the number of electrons that make up a charge of +24mC.