Atoms in a Low-Density, Hot Gas (E

question 139

Multiple Choice

Atoms in a low-density, hot gas (e.g., in a fluorescent lamp or a neon tube) emit a spectrum that is

• A) a series of emissions at specific colors whose wavelengths change in position as the gas temperature is changed.
• B) a series of emissions at certain wavelengths that are the same for all atoms but vary with temperature.
• C) a series of specific colors unique to the type of atom in the tube but fixed in position when the gas temperature changes.
• D) continuous over all visible wavelengths, with maximum intensity in the red.

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Definitions:

Sac

A fluid-filled structure in the body which can enclose or secrete substances, as in cysts or secretory cells.

Hemoptysis

The expectoration (coughing up) of blood or bloody sputum from the lungs or airways.

Spitting

Ejecting saliva forcibly from one's mouth, sometimes as a response to an irritant or infection.

Basophil

A type of white blood cell involved in inflammatory reactions and allergic responses by releasing histamine and other mediators.