Which of the following statements best reflects our current knowledge about the term flife in the equation

Number of Civilizations = NHP × flife × fcivilization × fnow?
A) The value of flife is either 0 or 1, but not anything in between.
B) The value of flife is between 0 and 1.
C) The value of flife is less than 0.0000001.
D) The value of flife is equal to 1/2.
E) The value of flife is greater than 0.9.


B) The value of flife is between 0 and 1.

Physics & Space Science

You might also like to view...

The Mohs scale is based on how many minerals?

a. 8 b. 10 c. 12 d. 15

Physics & Space Science

What is the use of the Doppler effect able to tell you about the motion of an object? What is it unable to tell you?

What will be an ideal response?

Physics & Space Science

For an orbital quantum number of 2, the magnetic quantum number can take on what allowed values?

What will be an ideal response?

Physics & Space Science

A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (? = 1.2 kg/m3.)

A. 70 Pa B. 85 Pa C. 100 Pa D. 120 Pa E. 81 Pa

Physics & Space Science