Quantum World

  • Thread starter azizlwl
  • Start date
  • #1
1,065
10
I watch a series on quantum world.
The host said particles can pass through each others.
And then he pushed a wall and said if he keep on pushing for billion of years, there will be possibilities he will pass through the wall.

We have more than 7 billions people in this world. I never heard that somebody fingers ever pass through any object.
I think the possibility is nil
 

Answers and Replies

  • #2
256bits
Gold Member
3,513
1,515
One person pushing on a wall for 7 billion years is not the same as 7 billion people pushing on a wall for 1 year.
If though you did hear of one person's fingers passing through a wall, it would not be believable, and would be considered a magic trick.
The host, or progam, was trying to expand the audiences' mind about quantum physics, albeit in a non-verifiable fashion. I suspect he gave no explanation for why billions of years was chosen over millions or trillions of years.

If you consider that a mole of substance is 6.02214179(30)×10^23 elementary particles and your hand weighs about 500 grams then you are looking at 10^25 particles in your hand that would have to 'pass through' a corresponding number of particles in the wall, all at the same time ( in unison).

so yeah, nil.
 
  • #3
117
0
Well , if particles can pass through each other, then how come when an anti-matter and matter collide , they annihilate and won't pass through each other.
 
  • #4
ZapperZ
Staff Emeritus
Science Advisor
Education Advisor
Insights Author
35,977
4,683
Well , if particles can pass through each other, then how come when an anti-matter and matter collide , they annihilate and won't pass through each other.

You are comparing apples and oranges. Tunneling means that a particle went through a POTENTIAL BARRIER. It does not mean that it went through another particle!

Zz.
 
  • #5
117
0
Oh well , i guess i misunderstood.
 
  • #6
Drakkith
Staff Emeritus
Science Advisor
21,310
5,151
I watch a series on quantum world.
The host said particles can pass through each others.
And then he pushed a wall and said if he keep on pushing for billion of years, there will be possibilities he will pass through the wall.

We have more than 7 billions people in this world. I never heard that somebody fingers ever pass through any object.
I think the possibility is nil

The key is to understand that there is a possibility of him passing through the wall. It is kind of like playing the lottery, but with odds so far against you that you have practically no hope of ever winning. The probability of a person quantum tunneling through a wall and appearing on the other side fully intact is so small that I don't think I have enough room to put all the zeroes in this post. (A rough estimate, but you get my point I hope) So while it is unbelievably small, it is not exactly zero.
 
  • #7
Drakkith
Staff Emeritus
Science Advisor
21,310
5,151
Well , if particles can pass through each other, then how come when an anti-matter and matter collide , they annihilate and won't pass through each other.

The term "collide" isn't very useful at the quantum scale. Things are described much differently in quantum mechanics than they are in classical physics.
 
  • #8
1,065
10
The key is to understand that there is a possibility of him passing through the wall. It is kind of like playing the lottery, but with odds so far against you that you have practically no hope of ever winning. The probability of a person quantum tunneling through a wall and appearing on the other side fully intact is so small that I don't think I have enough room to put all the zeroes in this post. (A rough estimate, but you get my point I hope) So while it is unbelievably small, it is not exactly zero.

Thanks. It is unbelievably small.
 

Related Threads on Quantum World

Replies
3
Views
9K
  • Last Post
Replies
1
Views
2K
Replies
3
Views
1K
  • Last Post
Replies
14
Views
2K
  • Last Post
Replies
5
Views
2K
Replies
5
Views
6K
G
Replies
10
Views
401
  • Last Post
Replies
15
Views
5K
Replies
3
Views
1K
Replies
1
Views
2K
Top