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).
The use of patterns is part of the way that Islamic art represents nature and objects by their spiritual qualities, not their physical and material qualities. The repeated geometric patterns often make use of plant motifs, and these are called arabesques. Stylised arabic lettering is also common.
Answer:
D.
Explanation:
The Domino theory was the belief that if Vietnam fell to Communism, so, too, would the other nations of Southeast Asia.
The Renaissance was a great cultural movement which brought about a period of scientific revolution and artistic transformation, at the dawn of modern European history. It marks the transitional period between the end of the Middle Ages and the start of the Modern Age.
The predominant view is that the Renaissance of the 15th century in Italy, spreading through the rest of Europe, represented a reconnection of the west with classical antiquity, the absorption of knowledge—particularly mathematics—from Arabic, the return of experimentalism, the focus on the importance of living well in the present (e.g. humanism), an explosion of the dissemination of knowledge brought on by printing and the creation of new techniques in art, poetry and architecture which led to a radical change in the style and substance of the arts and letters. This period, in this view, represents Europe emerging from a long period as a backwater, and the rise of commerce and exploration. The Italian Renaissance is often labelled as the beginning of the "modern" epoch.
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The European country that set up a trading center called "New Amsterdam" is A) The Netherlands.
