niyatocute9212
09.06.2021 •
Chemistry
A common issue in nuclear medicine is the short half-life of materials used for tests like PET or CT scans. The materials must be manufactured nearby so that they can be transported to a hospital quickly enough to be used for a patient when needed. It can be a tremendous advantage for a hospital to be near a laboratory capable of manufacturing rare isotopes. A good example of this is the F-18 isotope used for PET scans. It has a half-life of about 110 minutes. If a 50.0 mg sample of F-18 leaves the laboratory at 8:00 am, how many milligrams of F-18 remains in the sample when it arrives at the hospital at 1:30 pm?
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Ответ:
This question is testing your knowledge of the differences between solid and liquid particles. The particles of the solid vibrate around a fixed position, they can not move about while those of the liquid are able to move to some extent. The candy in Damien's pocket melted because it was heated up by the temperature of his body. Because the particles of the chocolate has been heated, they gain more kinetic energy and they vibrate faster compare to that of the solid chocolate.