16. What will happen to the Earth during the Sun\'s red giant phase? Select one:
ID: 231715 • Letter: 1
Question
16.What will happen to the Earth during the Sun's red giant phase?
Select one:
A. Earth will be engulfed by the expanding Sun.
B. Earth will escape from the Sun's gravity as it loses mass, drifting into interstellar space.
C. Earth's surface will be scorched by the Sun's increasing luminosity.
D. Earth will migrate into the outer solar system, eventually being captured by Jupiter.
17.The event that follows the 2nd red giant phase in the life of a Sun-like star is
Select one:
A. core collapse and a supernova explosion.
B. the star shrinks and cools, becoming a brown dwarf.
C. the ejection of a planetary nebula.
D. the start of helium fusion in the core.
E. the ignition of carbon fusion in the core.
20.What will be the mass of the Sun at the end of its life?
Select one:
A. About 0.5 solar masses
B. Between 0.1 and 0.2 solar masses
C. Still almost 1 solar mass since mass loss is negligible for a low-mass star like the Sun
D. About 0.8 solar masses
21.A white dwarf star is about the same size as
Select one:
A. Jupiter (about 10 Earths across).
B. the Sun (about 100 Earths across).
C. the Earth.
D. a major city.
22.White dwarf stars are supported from gravitational collapse by
Select one:
A. centrifugal force due to rapid rotation.
B. degenerate-electron pressure.
C. nuclear fusion reactions in a shell around the core.
D. nuclear fusion reactions in their cores.
Explanation / Answer
16) A, Giant stars have large radii as their name implies. When the Sun becomes a giant star, it may become so large as to engulf Earth, in which case the planet will be destroyed. Even if this does not happen, the sun will expand so far out that the temperatures on Earth will become extremely high so that all oceans will evaporate away, and there will be no water left on Earth.
17) D
20) A,A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses (M)) in a late phase ofstellar evolution.
21) C
22)A
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