Why Is There a Limited Range of Stellar Surface Temperatures

question 156

Multiple Choice

Why is there a limited range of stellar surface temperatures around 10,000 K at which neutral hydrogen gas absorbs visible light in the Balmer series?

• A) There must be electrons at the n = 3 energy level for Balmer absorption to occur. If the gas is too cold, electrons are only in the n = 1 and n = 2 levels; if the gas is too hot, the gas is ionized and no electrons are left in the hydrogen atoms.
• B) Electrons in hydrogen have to be at the n = 2 energy level to produce absorption in this series. If the gas is too cold, most atoms are in the n = 1 state; if it is too hot, most atoms are ionized.
• C) Electrons must be in the ground state n = 1 to undergo Balmer absorption. If the gas is too cold, electrons cannot be excited from this level; if the gas is too hot, there are no electrons left in the n = 1 level.
• D) There must be sufficient continuum radiation from the stellar surface in the visible region to be absorbed by the hydrogen gas.

Understand how migration affects labor supply curves in origin and destination countries.

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Referring to the rectum.

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pertains to the armpit area, an anatomical region under the junction where the arm connects to the shoulder.

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Relating to the mouth.

Rectal

Relating to, or situated near the rectum, the final straight portion of the large intestine that ends at the anus.