Which Sequence Correctly Lists the Spectral Classes of Stars in Order

question 56

Multiple Choice

Which sequence correctly lists the spectral classes of stars in order of decreasing temperature (from hottest to coolest) ?

• A) A B F G K M O
• B) O A B G F M K
• C) A F O B M G K
• D) O B A F G K M

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Definitions:

Statement Form

An expression using statement variables and connectives to state the logical form of an actual or possible statement.

Conditional

Involving or implying a condition in logic or mathematics, often expressed in "if... then..." statements that assert the dependency of one event or outcome on another.

Tautology

In logic, a statement that is true in every possible interpretation or a redundant expression that doesn't add informational value.

Disjunct

A component of a disjunction in logic, where the truth of any disjunct is sufficient for the truth of the disjunction.