answer 18-21 blue supergiant that is abol c) a contact binary, with the neutron
ID: 288249 • Letter: A
Question
answer 18-21
blue supergiant that is abol c) a contact binary, with the neutron star at 2.3 s d) an evolved red glant just starting to make silicon in its core nd o f supernova by the presence or absence of 18. stronomers can determine the ki hydrogen in the spectrum TRUE b) FALSE 19. ATy pe Il supernova is caused by the explosion of a massive star. DFALSE a) TRUE 20. a) carbon In massive stars nuclear burning can continue up to atoms as heavy as Diron c) oxygen d) helium 21. The sudden collapse of the iron core of a massive star into a compact ball o neutrons leads to a planetary nebula ejection protostellar disk c) molecular cloud d) supernova explosionExplanation / Answer
18. True. If a supernova's spectrum contains lines of hydrogen it is classified Type II; otherwise it is Type I.
19. True. A Type II supernova results from the rapid collapse and violent explosion of a massive star.
20. Iron. In the very massive stars, the reaction chain continues to produce elements like silicon upto iron.
21.D. Supernova explosion. The sudden collapse marks the begining of the supernova
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