input question: Extract the answer to the question from the following context. Question: What happens with shorter wavelengths? Context: The net quality of a ground reflection depends on the topography of the surface. When the irregularities of the surface are much smaller than the wavelength, we are in the regime of specular reflection, and the receiver sees both the real antenna and an image of the antenna under the ground due to reflection. But if the ground has irregularities not small compared to the wavelength, reflections will not be coherent but shifted by random phases. With shorter wavelengths (higher frequencies), this is generally the case.???
output answer: reflections will not be coherent but shifted by random phases

Extract the answer to the question from the following context. Question: During the summer, how does water disappear? Context: In an effort to conserve water, Tucson is recharging groundwater supplies by running part of its share of CAP water into various open portions of local rivers to seep into their aquifer. Additional study is scheduled to determine the amount of water that is lost through evaporation from the open areas, especially during the summer. The City of Tucson already provides reclaimed water to its inhabitants, but it is only used for "applications such as irrigation, dust control, and industrial uses." These resources have been in place for more than 27 years, and deliver to over 900 locations.
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Answer: through evaporation

Q: Extract the answer to the question from the following context. Question: Which political branch infringed upon the rights of black people? Context: Democrats were elected to the legislature and governor's office, but the Populists attracted voters displeased with them. In 1896 a biracial, Populist-Republican Fusionist coalition gained the governor's office. The Democrats regained control of the legislature in 1896 and passed laws to impose Jim Crow and racial segregation of public facilities. Voters of North Carolina's 2nd congressional district elected a total of four African-American congressmen through these years of the late 19th century.
A: Democrats

Question: Extract the answer to the question from the following context. Question: What countries are stable? Context: There is also a widespread view[vague][who?] that giving much more financial support to continuously cover the debt crisis or allow even higher budget deficits or debt levels would discourage the crisis states to implement necessary reforms to regain their competitiveness.[citation needed] There has also been a reluctance[citation needed] of financially stable eurozone states like Germany[citation needed] to further circumvent the no-bailout clause in the EU contracts and to generally take on the burden of financing or guaranteeing the debts of financially unstable or defaulting eurozone countries.[citation needed]
Answer: Germany

[Q]: Extract the answer to the question from the following context. Question: What were Willcock and Hopkins trying to do? Context: In the early 20th century, Carl von Voit and Max Rubner independently measured caloric energy expenditure in different species of animals, applying principles of physics in nutrition. In 1906, Edith G. Willcock and Frederick Hopkins showed that the amino acid tryptophan aids the well-being of mice but it did not assure their growth. In the middle of twelve years of attempts to isolate them, Hopkins said in a 1906 lecture that "unsuspected dietetic factors," other than calories, protein, and minerals, are needed to prevent deficiency diseases. In 1907, Stephen M. Babcock and Edwin B. Hart conducted the single-grain experiment, which took nearly four years to complete.
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[A]: isolate them

Problem: Given the question: Extract the answer to the question from the following context. Question: Why would a light be shaded? Context: An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the surroundings. The more transparent the lighting fixture is, the higher efficacy. Shading the light will normally decrease efficacy but increase the directionality and the visual comfort probability.
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The answer is:
increase the directionality and the visual comfort probability