As one stretches a metal wire, which condition is reached first?
A) the breaking point B) the proportional limit C) the elastic limit
B
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In a partially stabilized zirconia-calcia chemical sensor, the electrical conductivity is due primarily to:
(a) Electron flow in the conduction band (b) Hole diffusion in the valence band (c) Oxygen ion diffusion (d) Zirconium ion diffusion
In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because
A) our evening view of space depends on where Earth is located in its orbit around the Sun. B) during some times of year, some constellations drop below the southern horizon. C) some constellations are circumpolar. D) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky.
Elements have similar chemical properties because they have the same number of electrons in their ______________
Fill in the blank(s) with correct word
In a home steam radiator, thermal energy is released mainly by
A) evaporation. B) condensation. C) sublimation. D) none of the above