Problem: Consider a half-wave dipole designed to work with signals 1 m wavelength, meaning the antenna would be approximately 50 cm across. If the element has a length-to-diameter ratio of 1000, it will have an inherent resistance of about 63 ohms. Using the appropriate transmission wire or balun, we match that resistance to ensure minimum signal loss. Feeding that antenna with a current of 1 ampere will require 63 volts of RF, and the antenna will radiate 63 watts (ignoring losses) of radio frequency power. Now consider the case when the antenna is fed a signal with a wavelength of 1.25 m; in this case the reflected current would arrive at the feed out-of-phase with the signal, causing the net current to drop while the voltage remains the same. Electrically this appears to be a very high impedance. The antenna and transmission line no longer have the same impedance, and the signal will be reflected back into the antenna, reducing output. This could be addressed by changing the matching system between the antenna and transmission line, but that solution only works well at the new design frequency.
What effect occurs when the signal is reflected back into the antenna?
The answer is the following: reducing output

Problem: Roads in the US have been paved with materials that include asphalt/bitumen since at least 1870, when a street in front of the Newark, NJ City Hall was paved. In many cases, these early pavings were made from naturally occurring "bituminous rock", such as at Ritchie Mines in Macfarlan in Ritchie County, West Virginia from 1852 to 1873. In 1876, asphalt-based paving was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial. Asphalt/bitumen was also used for flooring, paving and waterproofing of baths and swimming pools during the early 20th century, following similar trends in Europe.
Since what date has asphalt been used for road paving in the US?
The answer is the following: 1870

Problem: In 1808, Napoleon and Czar Alexander met at the Congress of Erfurt to preserve the Russo-French alliance. The leaders had a friendly personal relationship after their first meeting at Tilsit in 1807. By 1811, however, tensions had increased and Alexander was under pressure from the Russian nobility to break off the alliance. A major strain on the relationship between the two nations became the regular violations of the Continental System by the Russians, which led Napoleon to threaten Alexander with serious consequences if he formed an alliance with Britain.
In what year did the Congress of Erfurt take place?
The answer is the following: 1808

Problem: The Bagmati River which flows through Kathmandu is considered a holy river both by Hindus and Buddhists, and many Hindu temples are located on the banks of this river. The importance of the Bagmati also lies in the fact that Hindus are cremated on its banks, and Kirants are buried in the hills by its side. According to the Nepali Hindu tradition, the dead body must be dipped three times into the Bagmati before cremation. The chief mourner (usually the first son) who lights the funeral pyre must take a holy riverwater bath immediately after cremation. Many relatives who join the funeral procession also take bath in the Bagmati River or sprinkle the holy water on their bodies at the end of cremation as the Bagmati is believed to purify people spiritually.
In addition to Hindus, who regards the Bagmati River as sacred?
The answer is the following:
Buddhists