# Do You Know Drake's Equation?

Approved & Edited by ProProfs Editorial Team
At ProProfs Quizzes, our dedicated in-house team of experts takes pride in their work. With a sharp eye for detail, they meticulously review each quiz. This ensures that every quiz, taken by over 100 million users, meets our standards of accuracy, clarity, and engagement.
| Written by EnidaK09
E
EnidaK09
Community Contributor
Quizzes Created: 7 | Total Attempts: 647
Questions: 10 | Attempts: 121  Settings  Are we alone in space? Well, that is the eternal question. Thanks to Drake's equation, we can predict the odds of meeting another intelligent civilization. But first, we need to know all about this equation. Are you ready to ace this quiz?

• 1.

### What does Drake's equation try to estimate?

• A.

The number of starts in the Milky Way

• B.

The number of planets in the Milky Way

• C.

The number of of active, communicative extraterrestrial civilizations in the Milky Way

• D.

The number of galaxies similar to Milky Way

C. The number of of active, communicative extraterrestrial civilizations in the Milky Way
Explanation
Drake's equation attempts to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way.

Rate this question:

• 2.

### Who created this equation?

• A.

Dr John Drake

• B.

Dr Drake Francis

• C.

Dr Frank Drake

• D.

Dr James Drake

C. Dr Frank Drake
Explanation
Dr Frank Drake is the creator of this equation.

Rate this question:

• 3.

### What does "R*" in the equation stand for?

• A.

The average rate of star formations in our galaxy

• B.

The approximate number of stars in our galaxy

• C.

The number of uninhabited planted

• D.

The fraction of planets bearing life on which intelligent, civilized life, has developed

A. The average rate of star formations in our galaxy
Explanation
The correct answer is "the average rate of star formations in our galaxy". The "R" in the equation represents the average rate at which stars are formed in our galaxy. This implies that the equation is related to the process of star formation and not any other factors such as the number of stars, uninhabited planets, or the fraction of planets with intelligent life.

Rate this question:

• 4.

### Which is the correct version of Drake's equation?

• A.

L = R* • fp • ne • fl • fi • fc •N

• B.

N = R* • fp • ne • fl

• C.

N = R* • fp • ne • fl • fi • fc

• D.

N = R* • fp • ne • fl • fi • fc • L

D. N = R* • fp • ne • fl • fi • fc • L
Explanation
The correct version of Drake's equation is N = R* • fp • ne • fl • fi • fc • L. This version includes all the variables necessary to estimate the number of civilizations in our galaxy that could potentially communicate with us. The variables represent different factors such as the rate of star formation, the fraction of stars with planets, the number of habitable planets per star, the fraction of habitable planets where life actually develops, the fraction of developed life that evolves into intelligent civilizations, the fraction of civilizations that develop technology to communicate, and the length of time that civilizations are capable of communicating.

Rate this question:

• 5.

### Why is the equation challenging for scientists?

• A.

The number of stars is a constantly changing number.

• B.

The number of life-suitable planets is always changing.

• C.

The scientists have no firm numbers of any variable.

• D.

The signals civilizations release into the space isn't detectable.

C. The scientists have no firm numbers of any variable.
Explanation
The equation is challenging for scientists because they do not have any definite or fixed numbers for any of the variables involved. This means that they cannot accurately determine the values or quantities needed to solve the equation.

Rate this question:

• 6.

### Which parameter states the fraction of planets with life that actually go on to develop intelligent life?

• A.

Fi

• B.

Fp

• C.

Fc

• D.

L

A. Fi
Explanation
The parameter "fi" states the fraction of planets with life that actually go on to develop intelligent life. This means that fi represents the proportion of planets that have life and eventually evolve to have intelligent beings.

Rate this question:

• 7.

### What does the L variable stand for?

• A.

The length of time for which civilizations release detectable signals into space

• B.

The fraction of life bearing planets on which intelligent life emerges

• C.

The fraction of those stars with planetary systems

• D.

The rate of formation of stars suitable for the development of intelligent life

A. The length of time for which civilizations release detectable signals into space
Explanation
The L variable stands for the length of time for which civilizations release detectable signals into space. This means that L represents the duration during which a civilization is actively transmitting signals that can be detected by others in space. This variable is important in the context of the search for extraterrestrial intelligence, as it helps estimate the likelihood of detecting signals from other civilizations based on how long they are actively transmitting them.

Rate this question:

• 8.

### Who proposed the revised equation that focuses on the search for planets with biosignature gases?

• A.

Alexander Zaitsev

• B.

Harlow Shapley

• C.

Astronomer Sara Seager

• D.

Dr Drake himself

C. Astronomer Sara Seager
Explanation
Astronomer Sara Seager proposed the revised equation that focuses on the search for planets with biosignature gases.

Rate this question:

• 9.

### What's another definition of Drake's equation?

• A.

It's an equation that calculates how many times intelligent civilizations have tried to contact us

• B.

It's an equation that predicts the number of potential extraterrestrial contacts

• C.

It's an equation that calculates the odds of finding intelligent life in the universe.

• D.

It's an equation that calculates the exact number of intelligent civilizations in the universe

C. It's an equation that calculates the odds of finding intelligent life in the universe.
Explanation
The correct answer is "It's an equation that calculates the odds of finding intelligent life in the universe." This explanation is supported by the fact that Drake's equation is a mathematical formula used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. It takes into account various factors such as the rate of star formation, the fraction of stars with planets, the number of habitable planets per star, and the average lifetime of a technologically advanced civilization. By calculating these probabilities, the equation provides an estimate of the likelihood of finding intelligent life in the universe.

Rate this question:

• 10.

### What is Drake's equation actually?

• A.

A probabilistic argument

• B.

A model theory

• C.

An axiom

• D.

A theorem Back to top