A Star Shows Strong Hydrogen Balmer Lines but Weak Lines

question 59

Multiple Choice

A star shows strong hydrogen Balmer lines but weak lines of neutral sodium.Which is a likely explanation for this phenomenon?

• A) There is no sodium in this particular star.
• B) The sodium atoms have all been completely ionized.
• C) The neutral sodium is receiving so much energy that the energy levels responsible for its usual spectrum are being depopulated.
• D) The neutral sodium is not receiving enough energy to excite its electrons to higher energy levels.

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