Binary (Double) Stars Can Be Detected by

question 11

Multiple Choice

Binary (double) stars can be detected by

• A) being seen as two separate stars with a telescope.
• B) one star traveling a wiggly proper-motion path across the sky.
• C) one star dimming abruptly as another passes in front of it.
• D) pairs of absorption lines seen in the spectrum of what appears to be one star.
• E) all of the above.

---

Definitions:

Concentration

Refers to the amount of a substance per defined space or unit volume.

Hypertonic

Describes a solution that has a higher concentration of solutes compared to another solution, causing cells to lose water.

Hypotonic

Describing a solution with a lower solute concentration compared to another solution, leading to water influx if two solutions are separated by a semipermeable membrane.

Isotonic

Describing a solution that has the same osmotic pressure as another solution, leading to no net movement of water across a cell membrane.