Context and question: The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scattering of electrons on thermal vibrations of the lattice, which are relatively weak for a soft metal. The maximum permissible current density of copper in open air is approximately 3.1×106 A/m2 of cross-sectional area, above which it begins to heat excessively. As with other metals, if copper is placed against another metal, galvanic corrosion will occur.
What metal has a higher thermal conductivity than copper?
Answer: silver
Context and question: Postwar broadcast coverage was extended to Birmingham in 1949 with the opening of the Sutton Coldfield transmitting station, and by the mid-1950s most of the country was covered, transmitting a 405-line interlaced image on VHF.[original research?]
The Coldfield Birmingham transmitting station helped cover what area in 1949?
Answer: unanswerable
Context and question: With his health further deteriorating, Chopin desired to have a family member with him. In June 1849 his sister Ludwika came to Paris with her husband and daughter, and in September, supported by a loan from Jane Stirling, he took an apartment at Place Vendôme 12. After 15 October, when his condition took a marked turn for the worse, only a handful of his closest friends remained with him, although Viardot remarked sardonically that "all the grand Parisian ladies considered it de rigueur to faint in his room."
In September 1849 where did Chopin take up residence?
Answer:
Place Vendôme 12