1. The half-life of a certain radioactive material is 1000 years. What fraction of the original amountremains after 1500 years?2. Just before 6:00 PM the body of a murder victim is found in a room that is kept at a constant temperatureof 20 °C. At 6:00 PM, the temperature of the body is 27 °C and at 7:00 PM it is 23 °C. If at the time ofdeath the temperature of the body is 35 °C, what was the time of death?

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Answered: 1. The half-life of a certain…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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fill in the blanks When an element has its proper complement of valence electrons, it is electrically _________; when an atom has more or fewer than that number, it is an ion and has an electric charge. The charge is ________ when extra electrons are present and ________ when some are missing. .The ____________ bond is formed among metallic atoms when some electrons in the valence shell separate from their orbital path and exist in a free state like a cloud or gas. Surrounding the positive nuclei in this highly mobile state, the negative cloud bonds the atoms together. Because the electrons in the cloud do not “belong” to any particular atoms, the bond strengths can vary, deformation can take place without rupture, and good heat and electrical conductivity can occur owing to the easy movement of electrons from one atomic site to the next. This type of bonding makes possible some of the useful characteristics of metals, both mechanical properties and physical properties.
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1. The half-life of a certain radioactive material is 1000 years. What fraction of the original amount remains after 1500 years?