Which type of planet once had (or has) a molten core?
A) Dwarf
B) Terrestrial
C) Jovian
B) Terrestrial
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The periods of the Cenozoic era are divided into time units called ______________
Fill in the blank(s) with correct word
What is the total mass of the Earth's atmosphere? The radius of the Earth is 6.4 × 106 m, and 1 atm = 1.01 × 105 N/m2.
A. 5.3 × 1016 kg B. 1.1 × 1018 kg C. 5.3 × 1018 kg D. 1.1 × 1020 kg E. 5.3 × 109 kg
On its way to Jupiter, Galileo also gave us close-ups of:
A) Mars and Venus. B) Ceres and Vesta. C) Gaspra and Ida. D) Mathilde and Eros. E) Mercury and Venus.
In a semiconductor doped with donor atoms, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At a high temperature there are approximately as many electrons in the conduction band as there are holes in the valence band. For this semiconductor, the Fermi energy is approximately equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV