What is the Fermi paradox?

What is the Fermi paradox?
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The Fermi paradox is the apparent contradiction between the high probability of the existence of extraterrestrial civilizations, as suggested by the Drake equation, and the lack of evidence for their existence, and has been the subject of much speculation and debate.
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Related questions

What is the Fermi paradox?

Description : What is the Fermi paradox?

Last Answer : The Fermi paradox is the apparent contradiction between the high likelihood of the existence of extraterrestrial civilizations and the lack of evidence for their existence

What is your solution to or thoughts on the Fermi paradox?

Description : What is your solution to or thoughts on the Fermi paradox?

Last Answer : answer:The size of the universe combined with the age of the universe makes the probability ridiculous. Consider that humans have only had written communication (And by that I mean the ability to ... it makes sense to believe that there may be advanced intelligent life out there somewhere, somewhen.

The Fermi Paradox asks, "Where is everybody?" Could intelligent life be mostly self extinguishing?

Description : The Fermi Paradox asks, "Where is everybody?" Could intelligent life be mostly self extinguishing?

Last Answer : answer:It's a good piece, and the overall thesis is worth thinking about. Still, it seems to me that there are several alternatives to the pessimistic hypothesis that intelligent life extinguishes ... think about how far away a civilization in another solar system-or even another galaxy-would be.

What is the Fermi-Dirac statistics?

Description : What is the Fermi-Dirac statistics?

Last Answer : The Fermi-Dirac statistics is a type of quantum statistics that describes the behavior of fermions, which are a type of subatomic particle that follow the rules of quantum mechanics, and are important in many areas of physics, including the behavior of electrons in solids.

What “Enrico Fermi” invented? A. X ray machine B. Betatron C. Cyclotron D. Nuclear reactor (Answer)

Description : What “Enrico Fermi” invented? A. X ray machine B. Betatron C. Cyclotron D. Nuclear reactor (Answer)

Last Answer : D. Nuclear reactor (Answer)

The name of the scientist who discovered neutron is - (1) Fermi (2) Rutherford (3) Chadwick (4) Bohr

Description : The name of the scientist who discovered neutron is - (1) Fermi (2) Rutherford (3) Chadwick (4) Bohr

Last Answer : (3) Chadwick Explanation: Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.

Nuclear sizes are expressed in a unit named - (1) Fermi (2) Angstrom (3) Newton (4) Tesla

Description : Nuclear sizes are expressed in a unit named - (1) Fermi (2) Angstrom (3) Newton (4) Tesla

Last Answer : (1) Fermi Explanation: The fermi (1 fm = 10⁻¹⁵ m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena.

Neutron was discovered by - (1) Chadwick (2) Rutherford (3) Fermi (4) Bohr

Description : Neutron was discovered by - (1) Chadwick (2) Rutherford (3) Fermi (4) Bohr

Last Answer : (1) Chadwick Explanation: Neutron was discovered by James Chadwick in the year 1932. The neutron is a subatomic particle, symbol n or n⁰, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms.

The most suitable unit for expressing nuclear radius is - (1) nanometre (2) fermi (3) angstrom (4) micron

Description : The most suitable unit for expressing nuclear radius is - (1) nanometre (2) fermi (3) angstrom (4) micron

Last Answer : (2) fermi Explanation: The atomic radius is a measure of the size of an atom. It is defined as one half the distance between the nuclei of two identical atoms that are bonded together. Angstrom is the most common unit used for measuring atomic radius.

Which unit we use to express nuclear sizes? (1) Tesla (2) Newton (3) Fermi (4) None of above

Description : Which unit we use to express nuclear sizes? (1) Tesla (2) Newton (3) Fermi (4) None of above

Last Answer : (3) Fermi

Natural radioactivity was discovered by - (1) Marie Curie (2) Ernest Rutherfor (3) Henri Becquerel (4) Enrico Fermi

Description : Natural radioactivity was discovered by - (1) Marie Curie (2) Ernest Rutherfor (3) Henri Becquerel (4) Enrico Fermi

Last Answer : (3) Henri Becquerel Explanation: The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of xrays, which had been discovered in 1895 by Wilhelm Roentgen.

Unit of radioactivity is (A) Barn (B) Fermi (C) Angstrom (D) Curie

Description : Unit of radioactivity is (A) Barn (B) Fermi (C) Angstrom (D) Curie

Last Answer : (D) Curie

The size of an atom is of the order of one (A) °Angstrom (B) Fermi (C) Micron (D) mm

Description : The size of an atom is of the order of one (A) °Angstrom (B) Fermi (C) Micron (D) mm

Last Answer : (A) °Angstrom

First experimental observation of nuclear fission was done by (A) Plane (B) Rutherford (C) Fermi (D) Hahn and Strassmann

Description : First experimental observation of nuclear fission was done by (A) Plane (B) Rutherford (C) Fermi (D) Hahn and Strassmann

Last Answer : (C) Fermi

Unit of radioactivity is (A) Barn (B) Fermi (C) Angstrom (D) Curie

Description : Unit of radioactivity is (A) Barn (B) Fermi (C) Angstrom (D) Curie

Last Answer : (D) Curie

Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density

Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density

Last Answer : c) Energy band gap

The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: A. Fresnel lines B. Fraunhofer lines C. Fermi lines D. Franklin lines

Description : The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: A. Fresnel lines B. Fraunhofer lines C. Fermi lines D. Franklin lines

Last Answer : B. Fraunhofer lines

The idea that we CANNOT know both the position and velocity of a subatomic particle at the same time was formulated by: w) Einstein x) Heisenberg y) Fermi z) Schroedinger

Description : The idea that we CANNOT know both the position and velocity of a subatomic particle at the same time was formulated by: w) Einstein x) Heisenberg y) Fermi z) Schroedinger

Last Answer : ANSWER: X -- HEISENBERG

The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: w) Fresnel lines x) Fraunhofer lines y) Fermi lines z) Franklin lines

Description : The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: w) Fresnel lines x) Fraunhofer lines y) Fermi lines z) Franklin lines

Last Answer : ANSWER: X -- FRAUNHOFER LINES

Which of the following men was involved with the first controlled nuclear reaction? w) Linus Pauling x) Nelson Sartoris y) Edward Teller z) Enrico Fermi

Description : Which of the following men was involved with the first controlled nuclear reaction? w) Linus Pauling x) Nelson Sartoris y) Edward Teller z) Enrico Fermi

Last Answer : ANSWER: Z -- ENRICO FERMI

The random motion of particles suspended in a fluid is called: w) Boson Condensation x) Fermi Motion y) Brownian Motion z) Pauli Motion

Description : The random motion of particles suspended in a fluid is called: w) Boson Condensation x) Fermi Motion y) Brownian Motion z) Pauli Motion

Last Answer : ANSWER: Y -- BROWNIAN MOTION

The most suitable unit for expressing nuclear radius is : (1) nanometre (2) fermi (3) angstrom (4) micron

Description : The most suitable unit for expressing nuclear radius is : (1) nanometre (2) fermi (3) angstrom (4) micron

Last Answer : angstrom

Define (i) Intrinsic semiconductor (ii)Fermi energy level

Description : Define (i) Intrinsic semiconductor (ii)Fermi energy level  

Last Answer : (i) Intrinsic semiconductor: The semiconductor in extremely pure form is called as intrinsic semiconductor.  (ii) Fermi energy level : The energy difference between conduction band and valence band is called as fermi energy level.

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room

Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Last Answer : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF:

Description : In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: (1) Remains unaltered (2) Moves towards the conduction band (3) Move towards the center of forbidden energy gap (4) May or may not move depending on temperature 

Last Answer : In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: Moves towards the conduction band

Fermi level is the measure of...

Description : Fermi level is the measure of  (A) Doping of electrons (B) Probability of occupancy of electrons or holes (C) Probability of occupancy of photons (D) Probability of occupancy of wavelength

Last Answer : (C) Probability of occupancy of photons

Fermi energy is the amount of energy which

Last Answer : Fermi energy is the amount of energy which Must be given to an electron to move it to conduction band.

what is fermi energy

Description : what is fermi energy

Last Answer : Fermi energy is the part of electron band diagram.Fermi energy is highest energy that the electron assume at T = 0 K. Fermi level comes in between conduction band and valance band. In case of ... , In case of semiconductor energy gap is small, And in case of conductor energy gap is overlap.

If time travel in both directions were possible, is the idea of a paradox a paradox?

Description : If time travel in both directions were possible, is the idea of a paradox a paradox?

Last Answer : Are you talking about some specific type of paradox? I don't think anything you've said would preclude the existence of one or any number of paradoxes. Maybe I've missed something. As to the ... more interesting or more coherent to say about 1 minute after my 15 minute editing window has expired.

Is the liar paradox easy to solve?

Description : Is the liar paradox easy to solve?

Last Answer : These things make my mind boggle, so i can’t say that what i say is true or false, but i would say that if he who said that line is known for always lying then i think the sentence is true.

Username update paradox confusion?

Description : Username update paradox confusion?

Last Answer : Contacting the school over this wouldn't jeopardize anything. It was a simple mistake, and it's preventing you from applying, which is jeopardizing your chances in itself. I'm not sure how ... email, sticking with your own email you originally entered or having your parents switch their emails.

If there were a time paradox, would current world destruction be immediate or gradual?

Description : If there were a time paradox, would current world destruction be immediate or gradual?

Last Answer : The future as you know it would not be destroyed. It would just never happen.

Can you figure out this apparent paradox?

Description : Can you figure out this apparent paradox?

Last Answer : answer:I would need to see the actual numbers and what exactly was being counted. Do they compare the absolute numbers of women vs men being accepted? Or do they compare it to how many men and women ... men to begin with. In that case, 100% of male applicants are accepted, vs only 23% of women.

What do you think of this solution to Newcomb's Paradox?

Description : What do you think of this solution to Newcomb's Paradox?

Last Answer : answer:Depends. Do you go for certainty or high probability. Choosing both nets you a guaranteed 1000$. However, the computer would most likely predict that choice, so the chance of an additional ... almost certain 1000000. Risk/reward tells me that taking just the second box is the best choice.

How does science reconcile the paradox of meeting yourself in the past during time travel?

Description : How does science reconcile the paradox of meeting yourself in the past during time travel?

Last Answer : 1. No such thing as a spirit . 2. Multiverse. You do not emerge in the past of your own time line, but an alternate one. You kill an alternate past self, not your own. 2b. Causal disconnect. The ... , but you will not even meet your past self, since you did not meet your future self in the past.

Can this paradox be resolved?

Description : Can this paradox be resolved?

Last Answer : How is it a benefit to swap? You’re getting money either way, so I don’t think it’s fair to say that getting ½ of what you could have gotten is a benefit.

Can you come up with a better story to go along with the unexpected hanging paradox?

Description : Can you come up with a better story to go along with the unexpected hanging paradox?

Last Answer : A watched pot never boils.

Is Zeno's paradox of Achilles and the tortoise really a follower's trap?

Description : Is Zeno's paradox of Achilles and the tortoise really a follower's trap?

Last Answer : answer:You're overanalizing the issue here. Zeno also suggested the arrow paradox, which is the same as the tortoise but without a moving target. It's a completely different issue made to try ... to zeno, not even his master Parmenides, supposedly, because he was clearly double bonkers on toast.

Can anyone give a good explanation of Zeno's paradox from a physics point of view?

Description : Can anyone give a good explanation of Zeno's paradox from a physics point of view?

Last Answer : answer:This gives a pretty good explanation and includes the wise observation that Any paradox can be treated by abandoning enough of its crucial assumptions. Head down to the paragraph that starts For Zeno' ... takes or doesn't and takes the one space next to it would be a Planck length.

The paradox of living: do you live for today or plan for the future?

Description : The paradox of living: do you live for today or plan for the future?

Last Answer : Now is the only moment there is.

Isn't there an unspoken mental health treatment paradox?

Description : Isn't there an unspoken mental health treatment paradox?

Last Answer : answer:The existence of prejudice against those with mental illness should not in any way stop someone from seeking help. I have a mental illness and use all the resources available in my small community to battle it. ... . Even though I have a mental illness, I am not a wackado, as you call it.

Can someone explain this economic paradox?

Description : Can someone explain this economic paradox?

Last Answer : I suspect that they’re loss leader products.

Would this not be a good example of a closed loop paradox?

Description : Would this not be a good example of a closed loop paradox?

Last Answer : No, it’s a disgusting example of a closed loop paradox.

Do you know any paradox like Pinocchio saying "My nose will grow now!"?

Description : Do you know any paradox like Pinocchio saying "My nose will grow now!"?

Last Answer : How is this a paradox? Where is the contradiction?

Have a Paradox?

Description : Have a Paradox?

Last Answer : Why is a package transported by car called a shipment and a package being transported by a ship called cargo?

Deterministic paradox? (Click to read more)

Description : Deterministic paradox? (Click to read more)

Last Answer : Of course it is ignoring Heisenberg uncertainty principle.

Why is quality (greatness) and the devil in the details? Is this a paradox or no?

Description : Why is quality (greatness) and the devil in the details? Is this a paradox or no?

Last Answer : It’s not a paradox. It’s really nothing when you think about it. Since everyone has different values regarding different things, how could one say that any one thing is in the details? It all comes down to subjective opinion.

What is your favorite paradox?

Description : What is your favorite paradox?

Last Answer : As for the bet, I'll take it. I know for a fact that none of the students in class I am currently moderating have the same birthday. And the class size is about 70 strong. do you want to know where ... will say this, though, in a weird twist, I have twins in my class that were born on differnt days

What's a paradox/oxymoron in your daily life?

Description : What's a paradox/oxymoron in your daily life?

Last Answer : Free time. Since I only get paid if I work, there is no free time.

You've traveled ten years into the past with your new time machine the Teslapple 2069s, you've brought along your Goomazon Parabitor 420XL as a paradox inhibitor, how will you change the timeline?

Description : You've traveled ten years into the past with your new time machine the Teslapple 2069s, you've brought along your Goomazon Parabitor 420XL as a paradox inhibitor, how will you change the timeline?

Last Answer : Buy more btc