When a Sound Wave Moves Through a Medium Such as Air

question 42

Multiple Choice

When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave) ?

• A) perpendicular
• B) parallel
• C) anti-parallel (in opposite direction)
• D) Both choices B and C are valid.

---

Definitions:

Correlational Measures

Statistical methods used to determine the extent to which two variables have a linear relationship with each other.

Correlation Coefficient

A statistical measure of the extent to which two factors vary together, and thus of how well either factor predicts the other. Scores with a positive correlation coefficient move up and down together (as with high school and college GPAs). A negative correlation coefficient indicates that one score falls as the other rises (as in the relationship between self-esteem and depression).

Statistical Measure

A quantitative value representing a summary or collection of data, such as mean, median, or mode.

Random Sequences

Arrangements of numbers or objects in which each possible arrangement is equally likely, lacking any predictable pattern or order.