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1) The nucleus of a certain atom has a radius of 4.0 × 10-15 m. An electron orbits the nucleus at a radius of 1.5 × 10-10 m. Imagine the electron orbit is on the surface of a sphere and that the shape of the nucleus is spherical. Approximately how many nuclei would fit into the sphere on which the electron orbits?
A) 5.3 × 1013
B) 4.9 × 1011
C) 1.4 × 109
D) 7.5 × 107
E) 3.8 × 104
2) AN object has a charge of -2 microC. How many electrons must be removed so that the charge becomes +3 microC?
3) Calculate the charrge of 1.25 moles of sodium ions (a sodium ion consists of 11 protons and 10 electrons.
q1. a stone has a mass of 5 x 10-4 kg and is wedged into the tread of an automobile tire as drawing shows. the
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A particle with a charge of -9 x 10-6C and a mass of 13 g moves uniformly with a speed of 4.6 m/s in a circular orbit around a stationary particle of charge 1 x 10-6C
A certain species of ionized atoms produces an emission line spectrum according to the Bohr model, but the number of protons Z in the nucleus is unknown. Find the next-to-the-longest wavelength in the series of lines
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