Answer: 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
Answer:
The National Road, in many places known as Route 40, was built between 1811 and 1834 to reach the western settlements. It was the first federally funded road in U.S. history. George Washington and Thomas Jefferson believed that a trans-Appalachian road was necessary for unifying the young country.
Explanation:
He said that the US would play a limited role in the league of nations. The US stayed neutral during world war 2
I hope this helps... Sorry if its wrong, im usually good in history
Answer: The Abbasid Caliphate became a center for learning from the 9th to the 13th centuries, gathering knowledge of India, China and ancient Greece, while also making important new contributions to mathematics, astronomy, philosophy, medicine and geography.
Explanation: Hope This Helps!!!!
