Why are terrestrial planets denser than jovian planets?
A) Actually, the jovian planets are denser than the terrestrial planets.
B) Only dense materials could condense in the inner solar nebula.
C) Gravity compresses terrestrial planets to a higher degree, making them denser.
D) The Sun's gravity gathered dense materials into the inner solar system.
B
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The half-life of 18N is 0.62 s. What is the decay constant for this isotope?
a. 0.43 s–1 b. 1.1 s–1 c. 1.7 × 10^–11 Ci d. The decay constant is not defined for a half-life of less than one second.
Protoplanets of the Jovian planets could have grown very hot from
a. heat for the sun. b. radioactivity of light elements such as hydrogen and helium. c. the in fall of material at high velocity. d. tidal forces due to the sun. e. collisions with large planetesimals.
Polycrystalline MgO is brittle at room temperature because to maintain continuity with plastic strain in a polycrystalline material, there must be at least _________active slip systems.
Fill in the blank(s) with the appropriate word(s).
P-waves travel faster through the inner core than the outer core because the inner core is
A) hotter than the outer core. B) the same as the outer core. C) rock. D) solid.