Which of the Following Statements Best Reflects Our Current Knowledge

question 73

Multiple Choice

Which of the following statements best reflects our current knowledge about the term ( f ) life in the equation Number of Civilizations == Np × flife × fcivilization × fnow?

• A)The value of ( f )life must be either 0 percent or 100 percent.
• B)The value of ( f )life is between 0 percent and 100 percent.
• C)The value of ( f )life is between 0 percent and 1 percent.
• D)The value of ( f )life is roughly 50 percent.
• E)The value of ( f )life is presently unknown but should be well known within just a few years.

---

Definitions:

Difference Threshold

The smallest amount by which a stimulus must be changed in order to notice that the change has occurred, also known as the just noticeable difference (JND).

Stimulus Level

The intensity of a stimulus which may influence the response it elicits from an organism or process.

Just Noticeable Difference

The smallest change in the intensity of a stimulus that can be detected.

Weber's Law

A principle in psychology stating that the just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus.