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:
Hello, There!
Why have archaeologists concluded that there was no social division between the wealthy and the poor in early Chinese cultures? .
<em>Poor families could not afford formal education for any of their children. Is the Correct Answer!</em>
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<em>Hope this Helps!</em>
That is a pretty broad thing. There is a changing of the guard at Arlington national cemetery and other memorial places across the country. They also do it in England at some of there important and historical sites. It usually refers to a event that happens when the Soldiers who have been stationed at one of these sights are rotated out in a very ceremonial manner. There are plenty of examples on youtube that you can look up.
Women played many
important roles once
they arrived at
Jamestown. Women
did chores and were
responsible for
educating the children
