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:
In the nation's growing cities, factory output grew, small businesses flourished, and incomes rose. As the promise of jobs and higher wages attracted more and more people into the cities, the U.S. began to shift to a nation of city dwellers.
Explanation:
Taking on the view of someone following God, God said when creating the earth to work 6 days and to keep the 7th holy. He even says in the 10 commandments to keep the Sabbath holy (which Is the 4th commandment). So not keeping the Sabbath was basically disobeying God which is why its so important for followers of Judaism (and Judea-Christians) to keep it holy/a day of rest.
Answer:
You know who else needs help with this
Step-by-step explanation:
MY MOM!!!
