Star a Is Identical to Star B, Except That Star

question 59

Multiple Choice

Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore, _ .

• A)both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A
• B)both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B
• C)both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A
• D)both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A

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Definitions:

Osmolality

Osmotic concentration of a solution; the number of moles of solute in 1 kg of water times the number of particles into which the solute dissociates.

Osmoreceptors

Specialized cells in the body that detect changes in plasma osmolality and contribute to the regulation of body fluids.

Extracellular Fluid

The body fluid located outside the cells, which includes interstitial fluid, plasma, and transcellular fluid.

Aldosterone

A hormone produced by the adrenal glands that regulates sodium and potassium levels in the blood, thereby controlling blood pressure and the balance of fluids in the body.