Type II Supernovae Show Prominent Lines of Hydrogen in Their

question 179

Multiple Choice

Type II supernovae show prominent lines of hydrogen in their spectra, whereas hydrogen lines are absent in spectra of Type Ia supernovae. Explain. (Hint: Think about the type of star that gives rise to each of the two types of supernova.)

• A) Massive stars contain large amounts of hydrogen, whereas white dwarfs are mostly carbon and oxygen.
• B) White dwarfs have a thick surface layer of hydrogen, whereas neutron stars contain no hydrogen at all.
• C) Massive stars have fused all their hydrogen into heavier elements, whereas low-mass stars still have large hydrogen-rich envelopes.
• D) Massive stars contain large amounts of hydrogen, whereas neutron stars contain no hydrogen at all.

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Definitions:

High-Level Languages

High-level languages are programming languages designed to simplify computer programming by allowing a more natural language expression closer to human language, compared to low-level programming languages.

Machine Language

A low-level programming language that is directly understood by the computer's CPU, consisting of binary or hexadecimal instructions.

Low-Level Language

A Low-Level Language is a programming language that provides little or no abstraction from a computer's instruction set architecture, closer to machine code.

% Modulus

The operator used in arithmetic to find the remainder of division between two integers.