The remaining core of a planetary nebula is called a _______________

a. white dwarf
b. neutron star
c. black hole
d. red giant

a

Physics & Space Science

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Which of the following is a weak acid?

a. Hydrochloric acid b. Nitric acid c. Sulfuric acid d. Acetic acid

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The dominant semiconducting material now in use is

A. silicon. B. carbon. C. germanium. D. gallium.

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A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles. If the resistance per length in the wire is 0.5 W/mile, what is the power loss due to resistive losses?

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The BCS theory of superconductivity details the working of a superconductor. Choose the statement below that describes one of its characteristics

a. Single electrons are responsible for establishing currents in the superconductor. b. Currents flow without resistance until the lattice begins to vibrate. c. The repulsion of electrons in pairs is significantly reduced by the extremely low temperatures of superconductor operation, making electron pairing possible. d. A pair of electrons becomes like a boson and transitions to a ground state with other electron pairs.

e. The resistance decreases in proportion to the lattice vibrations, which in turn decrease with decreasing temperature.

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Physics & Space Science