Measurements of the magnetic field of Venus reveal that the
a. planet has a large iron core.
b. interior of the planet is molten.
c. planet has no detectable magnetic field.
d. planet rotates backwards.
e. magnetic field is responsible for large auroral displays (northern lights) on Venus.
C
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A depth change of 10 metres/33 feet causes a pressure change of.
a. 1 bar/ata b. 2 bar/ata c. 3 bar/ata d. 4 bar/ata
In a muggy region, the extra warmth you often feel is mainly due to
A) evaporation. B) condensation. C) sublimation. D) none of the above
Energy Levels: What is the ionization energy of singly-ionized helium, which has 2 protons?
A. 54.4 eV B. 13.6 eV C. 27.2 eV D. 6.80 eV E. 36.4 eV
What prevents stars greater than about 100 times the Sun's mass from existing?
A) The rate of thermal expansion would overcome gravitational attraction leading to explosion. B) The gravitational attraction would overcome the rate of thermal expansion leading to a black hole. C) Fusion cannot take place at these higher mass levels. D) The gaseous material of the universe is too widely dispersed to allow for the formation of stars of this mass.