Question: Read this and answer the question

Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born[N 3] scientist, inventor, engineer and innovator who is credited with patenting the first practical telephone.

What is Bell famous for inventing?
Answer: telephone


Problem: Beginning in first decade of the 15th century, Jan Hus—a Roman Catholic priest, Czech reformist and professor—influenced by John Wycliffe's writings, founded the Hussite movement. He strongly advocated his reformist Bohemian religious denomination. He was excommunicated and burned at the stake in Constance, Bishopric of Constance in 1415 by secular authorities for unrepentant and persistent heresy. After his execution, a revolt erupted. Hussites defeated five continuous crusades proclaimed against them by the Pope.
How did Jan Hus die?
The answer is the following: burned at the stake


Commercial solar water heaters began appearing in the United States in the 1890s. These systems saw increasing use until the 1920s but were gradually replaced by cheaper and more reliable heating fuels. As with photovoltaics, solar water heating attracted renewed attention as a result of the oil crises in the 1970s but interest subsided in the 1980s due to falling petroleum prices. Development in the solar water heating sector progressed steadily throughout the 1990s and growth rates have averaged 20% per year since 1999. Although generally underestimated, solar water heating and cooling is by far the most widely deployed solar technology with an estimated capacity of 154 GW as of 2007.
Since 1999, what average rate has the solar water heating sector progressed at?
20% per year


Input: Modern history
The Franco-Prussian War was a conflict between France and Prussia, while Prussia was backed up by the North German Confederation, of which it was a member, and the South German states of Baden, Württemberg and Bavaria. The complete Prussian and German victory brought about the final unification of Germany under King Wilhelm I of Prussia. It also marked the downfall of Napoleon III and the end of the Second French Empire, which was replaced by the Third Republic. As part of the settlement, almost all of the territory of Alsace-Lorraine was taken by Prussia to become a part of Germany, which it would retain until the end of World War I.

What did the Prussian and German victory mark?
Output: final unification of Germany under King Wilhelm I of Prussia.


Input: Article: In a grounded-emitter transistor circuit, such as the light-switch circuit shown, as the base voltage rises, the emitter and collector currents rise exponentially. The collector voltage drops because of reduced resistance from collector to emitter. If the voltage difference between the collector and emitter were zero (or near zero), the collector current would be limited only by the load resistance (light bulb) and the supply voltage. This is called saturation because current is flowing from collector to emitter freely. When saturated, the switch is said to be on.

Now answer this question: Why does the collector voltage drop in grounded-emitter transistor circuits?

Output: reduced resistance from collector to emitter


Problem: Saxophones appear in some scores from the late 19th century onwards. While appearing only as featured solo instruments in some works, for example Maurice Ravel's orchestration of Modest Mussorgsky's Pictures at an Exhibition and Sergei Rachmaninoff's Symphonic Dances, the saxophone is included in other works, such as Ravel's Boléro, Sergei Prokofiev's Romeo and Juliet Suites 1 and 2 and many other works as a member of the orchestral ensemble. The euphonium is featured in a few late Romantic and 20th-century works, usually playing parts marked "tenor tuba", including Gustav Holst's The Planets, and Richard Strauss's Ein Heldenleben.
How is the saxophone features in Ravel's Bolero?
The answer is the following:
as a member of the orchestral ensemble