An electron's de Broglie wavelength is 2.4 ?m. What is its speed?
A) 3.0 × 102 m/s
B) 2.5 × 105 m/s
C) 1.7 × 103 m/s
D) 8.3 × 106 m/s
A
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Which of the following is always true about a 1.2-solar mass white dwarf compared to a 1.0 solar mass white dwarf?
A) The more massive white dwarf has a larger radius. B) The more massive white dwarf has a smaller radius. C) The more massive white dwarf has a higher surface temperature. D) The more massive white dwarf has a lower surface temperature. E) The more massive white dwarf is supported by neutron degeneracy pressure, rather than electron degeneracy pressure.
The energy source responsible for molecular motions in Earth's atmosphere is
A) their own natural kinetic energy. B) pressure caused by the weight of air. C) atmospheric tides. D) the Sun.
When air is compressed, its temperature
A) increases. B) decreases. C) neither of these
Arrange the following images of an aqueous base solution in order of increasing base strength:
A) A, B, C B) B, C, A C) C, B, A D) A, C, B E) All are equally strong.