Examlex
The energy difference between the upper and lower levels in a certain laser is 1.9593 eV. What is the wavelength of the light emitted by the laser?
Slavery Problems
Issues and challenges related to the historical institution of slavery, including moral, economic, and social implications, as well as its lasting effects on societies.
Self-Rule
Self-rule refers to a government system where a country, region, or community is governed by its own people, rather than being controlled by a foreign power.
Abolition Movement
The campaign aimed at ending slavery and the slave trade, which gained prominence in the United States from the late 18th century to the Civil War years.
Thoreau
Henry David Thoreau, a 19th-century American essayist, poet, and philosopher known for his writings on nature and society.
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