Marie Curie studied the radiation of all compounds containing the known radioactive elements, including uranium and thorium, which she later discovered was also radioactive. She also found out that:
- you can exactly measure the strength of the radiation from uranium;
- the intensity of the radiation is proportional to the amount of uranium or thorium in the compound - no matter what compound it is;
- the ability to emit radiation does not depend on the arrangement of the atoms in a molecule; it must be linked to the interior of the atom itself - a revolutionary discovery!
When she realized that some uranium and/or thorium compounds had stronger radiation than uranium, she made the following hypothesis: there must be an unknown element in the compound which had a stronger radiation than uranium or thorium. Her work aroused the interest of her husband, Pierre Curie, who stopped his own research on crystals and joined the "detective work" with his wife. And Marie was proven right: in 1898 the Curies discovered two new radioactive elements: radium (named after the Latin word for ray) and polonium (named after Marie's home country, Poland).
Answer:
portugese is the answer to this question.
Explanation:
Explanation:
The Catholic Church declares that the presence of Christ in the Eucharist is true, real, and substantial. By saying Christ is truly present in the Eucharist, it excludes any understanding of the presence as merely that of a sign or figure.
Answer:
Cuban Missile Crisis.
Explanation:
Cuba, which was an ally of the USSR that is located off the shores of the United States, was receiving shipments of Nuclear-armed Missiles, which were in range of several US installments and shipments. The US ran surveillance as well as a blockade in an effort to keep the ballistic missiles from entering Cuba.
The event was resolved when the USSR agreed to remove the ballistic missiles, in which they in turn asked the US to remove theirs from Turkey. The settlement was made, and crisis was averted.
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