Problem: Investitures, which include the conferring of knighthoods by dubbing with a sword, and other awards take place in the palace's Ballroom, built in 1854. At 36.6 m (120 ft) long, 18 m (59 ft) wide and 13.5 m (44 ft) high, it is the largest room in the palace. It has replaced the throne room in importance and use. During investitures, the Queen stands on the throne dais beneath a giant, domed velvet canopy, known as a shamiana or a baldachin, that was used at the Delhi Durbar in 1911. A military band plays in the musicians' gallery as award recipients approach the Queen and receive their honours, watched by their families and friends.
What does the Queen stand on during Investitures?
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Answer: the throne dais


Problem: By the early 1970s, softer songs by artists like The Carpenters, Anne Murray, John Denver, Barry Manilow, and even Streisand, began to be played more often on "Top 40" radio and others were added to the mix on many AC stations. Also, some of these stations even played softer songs by Elvis Presley, Linda Ronstadt, Elton John, Rod Stewart, Billy Joel, and other rock-based artists.
During what period were artists like Anne Murray and Barbra Streisand featured on Top 40 radio?
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Answer: the early 1970s


Problem: In flood lamps used for photographic lighting, the tradeoff is made in the other direction. Compared to general-service bulbs, for the same power, these bulbs produce far more light, and (more importantly) light at a higher color temperature, at the expense of greatly reduced life (which may be as short as two hours for a type P1 lamp). The upper temperature limit for the filament is the melting point of the metal. Tungsten is the metal with the highest melting point, 3,695 K (6,191 °F). A 50-hour-life projection bulb, for instance, is designed to operate only 50 °C (122 °F) below that melting point. Such a lamp may achieve up to 22 lumens per watt, compared with 17.5 for a 750-hour general service lamp.
What lamp can achieve up to 23 lumens per watt?
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Answer:
unanswerable