Copper is in Group IB of the periodic table, is FCC, and its roomtemperature lattice parameter is 0.362 nm.
(a) Calculate the free-electron density in Cu.
(b) The electrical conductivity of Cu at room temperature is 6.0×107 (??m)-1. Calculatethe mobility of free electrons in Cu.
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In this photo, the left side of a ceramic dish is ice-cold while the right side is very hot. What property of a ceramic, at the atomic/molecular level, would make it a poor heat conductor compared with a copper dish?
a. Ceramics fall apart at high temperatures. b. Only colliding and vibrating atoms transfer their motion to each other and cause conduction. c. The electrons in the ceramic, which is an electrical insulator, are not as free to move over large distances to help transfer thermal energy. d. Only electrons that conduct electric current can transfer energy and cause heat conduction. e. Only metals conduct heat.
Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is
A) the wall pulling oppositely on the spring. B) the spring pulling on Harry. C) both the wall and the spring pulling on Harry. D) none of the above
An accelerating frame of reference cannot be distinguished from a gravitational field
Indicate whether the statement is true or false
A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle?
a. 5.50368 m2 b. 5.5037 m2 c. 5.504 m2 d. 5.50 m2 e. 5.5 m2