Problem: Although a resonant antenna has a purely resistive feed-point impedance at a particular frequency, many (if not most) applications require using an antenna over a range of frequencies. An antenna's bandwidth specifies the range of frequencies over which its performance does not suffer due to a poor impedance match. Also in the case of a Yagi-Uda array, the use of the antenna very far away from its design frequency reduces the antenna's directivity, thus reducing the usable bandwidth regardless of impedance matching.
What term can be used to refer to the usable spectrum of an antennas frequency?
The answer is the following: bandwidth

Problem: Lighting or illumination is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants.
What kind of effects can natural illumination have on a persons psychological?
The answer is the following: positive

Problem: The site of Richmond had been an important village of the Powhatan Confederacy, and was briefly settled by English colonists from Jamestown in 1609, and in 16101611. The present city of Richmond was founded in 1737. It became the capital of the Colony and Dominion of Virginia in 1780. During the Revolutionary War period, several notable events occurred in the city, including Patrick Henry's "Give me liberty or give me death" speech in 1775 at St. John's Church, and the passage of the Virginia Statute for Religious Freedom written by Thomas Jefferson. During the American Civil War, Richmond served as the capital of the Confederate States of America. The city entered the 20th century with one of the world's first successful electric streetcar systems, as well as a national hub of African-American commerce and culture, the Jackson Ward neighborhood.
When was Richmond first settled?
The answer is the following: 1609

Problem: As the summit closed on 28 September 1970, hours after escorting the last Arab leader to leave, Nasser suffered a heart attack. He was immediately transported to his house, where his physicians tended to him. Nasser died several hours later, around 6:00 p.m. Heikal, Sadat, and Nasser's wife Tahia were at his deathbed. According to his doctor, al-Sawi Habibi, Nasser's likely cause of death was arteriosclerosis, varicose veins, and complications from long-standing diabetes. Nasser was a heavy smoker with a family history of heart diseasetwo of his brothers died in their fifties from the same condition. The state of Nasser's health was not known to the public prior to his death. He had previously suffered heart attacks in 1966 and September 1969.
When did Nasser die?
The answer is the following:
28 September 1970