Problem: Due to reciprocity (discussed above) the gain of an antenna used for transmitting must be proportional to its effective area when used for receiving. Consider an antenna with no loss, that is, one whose electrical efficiency is 100%. It can be shown that its effective area averaged over all directions must be equal to 2/4, the wavelength squared divided by 4. Gain is defined such that the average gain over all directions for an antenna with 100% electrical efficiency is equal to 1. Therefore, the effective area Aeff in terms of the gain G in a given direction is given by:
what could an antenna with complete electrical efficiency be said to have?
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Answer: no loss

Problem: Baptism is a requirement for being considered a member of Jehovah's Witnesses. Jehovah's Witnesses do not practice infant baptism, and previous baptisms performed by other denominations are not considered valid. Individuals undergoing baptism must affirm publicly that dedication and baptism identify them "as one of Jehovah's Witnesses in association with God's spirit-directed organization," though Witness publications say baptism symbolizes personal dedication to God and not "to a man, work or organization." Their literature emphasizes the need for members to be obedient and loyal to Jehovah and to "his organization,"[note 2] stating that individuals must remain part of it to receive God's favor and to survive Armageddon.
Will an unbaptized infant survive or not if a sudden Armageddon were to occur?
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Answer: unanswerable

Problem: In 1603, James VI, King of Scots, ascended (as James I) to the English throne and in 1604 negotiated the Treaty of London, ending hostilities with Spain. Now at peace with its main rival, English attention shifted from preying on other nations' colonial infrastructures to the business of establishing its own overseas colonies. The British Empire began to take shape during the early 17th century, with the English settlement of North America and the smaller islands of the Caribbean, and the establishment of private companies, most notably the English East India Company, to administer colonies and overseas trade. This period, until the loss of the Thirteen Colonies after the American War of Independence towards the end of the 18th century, has subsequently been referred to by some historians as the "First British Empire".
What was James I's name/title before taking the English throne?
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Answer:
James VI, King of Scots