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# Nitrogen-13 is a 9.97-min-half-life isotope used to tag ammonia for PET scans, including

ISBN: 9780134202709 403

## Solution for problem 50 Chapter 38

Essential University Physics | 3rd Edition

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Problem 50

Nitrogen-13 is a 9.97-min-half-life isotope used to tag ammonia for PET scans, including quantification of myocardial infarction. Consider an intravenous injection incorporating 20.0 mCi of N-13. Plot a graph of N-13 activity versus time, with your vertical axis logarithmic and your horizontal axis linear. Why is the graph a straight line? Whats the significance of its slope?

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Week 2 Monday, August 29, 2016 12:03 AM • Charging by rubbing- if you rub glass rod with silk, e- transfer from rod to silk leaves equal + charge on rod..only rubbed area is charged • Polarization: ○ In neutral atoms:center of + charge coincides w/ center of - charge ○ Charged atoms:centers separate from electric force  Causes electric dipole(polarization) ○ Ex) neutral wall w + balloon…+ charged balloon will induce - charge on insulator(wall) • Coulomb's law- electric force has following properties: ○ Directed along line joining 2 charged particles ○ Inversely proportional to square of separation distance (r) btwn them Proportionalto product of mags of ch

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