In chemistry, reduction occurs when a substance
A) accepts electrons
B) loses electrons
C) rearranges its electrons internally
D) breaks into its constituent atoms
A
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General Relativity: What mass would have to be compressed to a radius of 1.0 × 10-15 m (the order of magnitude of the radius of an atomic nucleus) in order for it to become a black hole? (G = 6.67 × 10-11 N ? m2/kg2, c = 3.0 × 108 m/s)
A. 1.1 × 10-6 kg B. 4.1 × 10-8 kg C. 2.2 × 103 kg D. 6.7 × 1011 kg E. 8.3 × 1015 kg
Escape Speed: Planet A has twice the mass of Planet B. From this information, what can we conclude about the escape speed for Planet A compared to that of Planet B?
A. The escape speed for Planet A must be twice as great as the escape speed from Planet B. B. The escape speed for Planet A must be four times as great as the escape speed from Planet B. C. The escape speed for Planet A is the same as the escape speed from Planet B. D. The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater. E. We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.
A nonrelativistic electron has a kinetic energy of 5.4 eV. What is the energy of a photon whose wavelength is the same as the de Broglie wavelength of the electron? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 2.4 keV B) 2.2 keV C) 2.0 keV D) 2.5 keV E) 2.7 keV
In a gaseous mixture of hydrogen and oxygen, the faster molecules on average are
A) hydrogen. B) oxygen. C) both the same D) not enough information