Which of the following hypothetical observations, if true, would disprove a prediction of the Big Bang theory?
A) the discovery that the temperature of the universe is only 2.73 K
B) the discovery of a galaxy moving toward us
C) the discovery of two galaxies at the same distance, moving away with slightly different speeds
D) the discovery of a galaxy with 30% helium abundance
E) the discovery of a galaxy with 10% helium abundance
E
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What is the potential difference Vb ? Va shown in the circuit below
a.
?8.0 V
b.
+8.0 V
c.
?18 V
d.
+18 V
e.
?12 V
The saturation magnetization of nickel measured at room temperature is 5.1×105 A/m.
(a) Calculate the average number of Bohr magnetons on a nickel atom, knowing that nickel has an FCC structure with an atom at 0,0,0. At room temperature the lattice parameter is 0.352 nm. (b) Compare your answer to part (a) with the theoretical number of Bohr magnetons based upon the atomic electron structure of nickel, and explain any possible difference.
Which of the following is an almost reversible process?
A. The explosion of hydrogen and oxygen to form water. B. Heat transfer through thick insulation. C. The adiabatic free expansion of a gas. D. A slow isothermal compression of a gas. E. A slow leakage of gas into an empty chamber through a small hole in a membrane.
Discuss your understanding of the author's meaning in the statement, referring to efficiency of a hydrogen economy that "if solar energy is the source of the energy
, the efficiency" of the hydrogen energy production system "is of less concern."