Question 30 Which Of The Following Are Old Stars With No Current Nuclear Reactions A Red Giants B Main Sequence Stars 1 (49.24 KiB) Viewed 95 times
Question 30 Which Of The Following Are Old Stars With No Current Nuclear Reactions A Red Giants B Main Sequence Stars 2 (24.57 KiB) Viewed 95 times
QUESTION 30 Which of the following are old stars with no current nuclear reactions a. red giants b. main sequence stars c. white dwarfs d. proto stars QUESTION 31 Massive stars have short lifetimes because they O a. have little available fuel b. can't sustain high enough temperatures c. are too large d. consume their fuel more rapidly QUESTION 32 Which of the following stars will spend the most time on the main sequence? O a. a 3 solar mass star b. a 10 solar mass star c. the Sun O d. 0.5 solar mass star
QUESTION 33 Our knowledge of the stellar evolutionary paus on the HR diagram is derived from O a. observation of changes in stellar brightnesses with time O b. calculations of models on high-speed electronic computers O c observations of the main sequence O d. experiments with hydrogen, helium, and carbon fusion reactions conducted on Earth QUESTION 34 After a star's core runs out of fuel, how does the core get to a high enough temperature to ignite the next stage of fusion reactions? O a. by chemical reactions. b. by other fusion reactions, Oo, by gravitational contraction. d. none of these; the fusion reactions stop.
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