A common fuel impurity in fossil fuels is
a. sulfur.
b. radon.
c. carbon.
d. hydrogen.
a
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A standing wave is likely produced when
A) two waves overlap. B) a wave reflects upon itself. C) the speed of the wave is zero or near zero. D) the amplitude of a wave exceeds its wavelength.
In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy
a. is equal to the kinetic energy of the electron. b. is twice the kinetic energy of the electron. c. is half the kinetic energy of the electron. d. is equal to n2 times the kinetic energy of the electron.
Series/Parallel Circuits: What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 6.0 V B. 4.0 V C. 3.0 V D. 2.0 V
Why is the regolith light-colored in the highlands, while darker in the maria?
A. The highland regions receive more sunlight than the maria. B. The highland regolith is younger, and therefore lighter in color. C. Lunar regolith is the same color everywhere, but the maria reflect less light. D. The regolith in the maria has a different mineral composition.