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Nuclear Changes
a. Write the nuclear equation for the alpha decay of 221 Rn 86.
b. Write the nuclear equation for the radioactive decay of 21 P 15 by positron emission.
c. Imagine that you started with a 0.1 g sample of iodine-131, and now you have only 0.025 g remaining. If the half-life of iodine-131 is 8 days, how old is the sample? explain your reasoning.
d. Draw a diagram that illustrates how nuclei change during nuclear fusion. describe the process of nuclear fusion, including where it occurs and how the energy released can be harnessed for use in homes.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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