# The Naked Scientists Forum

### Author Topic: Does light particles always follows Heisenberg Uncertainty Principle ?  (Read 3836 times)

#### ScientificBoysClub

• Guest
##### Does light particles always follows Heisenberg Uncertainty Principle ?
« on: 30/04/2009 16:54:23 »
consider light traveling from A to B ....

Now I would like to ask u guys ...

when light traveling from A to B .. is it possible that they follow Uncertainty Principle .. travailing from A to B ..!! like let A be the Sun and B be the Earth .. so, light coming from sun always follow Uncertainty Principle ..

Does the position and velocity of light particles always change ?

What does it mean if it follows Heisenberg Uncertainty Principle ?

But we know that light travels with constant velocity C ...  and what does it mean that we can't find both Velocity of light particle and position too ?

I am writing a theory about it .. if its true than I can continue writing !!
« Last Edit: 01/05/2009 09:24:26 by ScientificBoysClub »

#### JP

• Neilep Level Member
• Posts: 3366
• Thanked: 2 times
##### Re: Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #1 on: 30/04/2009 17:43:58 »
I'm not sure what your question is asking.  In your own words, how would you explain the uncertainty principle?

#### ScientificBoysClub

• Guest
##### Re: Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #2 on: 01/05/2009 05:25:12 »
I'm not sure what your question is asking.  In your own words, how would you explain the uncertainty principle?
I mean to say that  if u observe a particle between A and B we can't find both position and velocity at a time .. is it true for light?

#### Raghavendra

• Hero Member
• Posts: 835
• Quantum
##### Re: Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #3 on: 01/05/2009 08:18:54 »
Your question is Does light particles changes it's direction when they travel from A to B..... Uncertainty relation ( Mass times the Velocity) Even you have to think about the particles of light, to get exact momentum.
Using this relation...
Δp Δq ≥ h / 4π

ΔE Δt ≥ h / 4π

But the particles will not be in same direction, they change when with time & speed ...
When we think about the Light traveling in the particles medium.... You can't find the direction of the particle... keeping Light as constant... You have to consider that light is origin, it is not a source... Lot of people would confuse about the topic.. But i am intrested in it...

In light particle we can't find the exact position and velocity, but we can't find...
But your Question is quite twisted towards paricle and light..... Hmm i need more explanation from you....

#### ScientificBoysClub

• Guest
##### Re: Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #4 on: 01/05/2009 09:15:09 »
I'm not sure what your question is asking.  In your own words, how would you explain the uncertainty principle?
I mean is it possible to find the position and velocity of the photon particle between A and B ?

#### ScientificBoysClub

• Guest
##### Re: Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #5 on: 01/05/2009 09:15:41 »
Your question is Does light particles changes it's direction when they travel from A to B..... Uncertainty relation ( Mass times the Velocity) Even you have to think about the particles of light, to get exact momentum.
Using this relation...
Δp Δq ≥ h / 4π

ΔE Δt ≥ h / 4π

But the particles will not be in same direction, they change when with time & speed ...
When we think about the Light traveling in the particles medium.... You can't find the direction of the particle... keeping Light as constant... You have to consider that light is origin, it is not a source... Lot of people would confuse about the topic.. But i am intrested in it...

In light particle we can't find the exact position and velocity, but we can't find...
But your Question is quite twisted towards paricle and light..... Hmm i need more explanation from you....

No, dude Here I am not talking about change of direction ...

I am talking about Light traveling between A and B.

in between A and B ... Does light follow the principle as i said in question ?
I mean is it possible to find the position and velocity of the photon particle between A and B ?   What does it mean if it follows Heisenberg Uncertainty Principle ?

But we know that light travels with constant velocity C ...  and what does it mean that we can't find both Velocity of light particle and position too ?

« Last Edit: 01/05/2009 09:25:36 by ScientificBoysClub »

#### ScientificBoysClub

• Guest
##### Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #6 on: 01/05/2009 09:24:57 »
I'm not sure what your question is asking.  In your own words, how would you explain the uncertainty principle?
What does it mean if it follows Heisenberg Uncertainty Principle ?

But we know that light travels with constant velocity C ...  and what does it mean that we can't find both Velocity of light particle and position too ?

#### JP

• Neilep Level Member
• Posts: 3366
• Thanked: 2 times
##### Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #7 on: 01/05/2009 15:23:28 »
I'm not sure what your question is asking.  In your own words, how would you explain the uncertainty principle?
I mean to say that  if u observe a particle between A and B we can't find both position and velocity at a time .. is it true for light?

Yes, it says that the accuracy with which you can know momentum and the accuracy with which you can know position are inversely proportional.

With light, the momentum is hbar*ν/c.
« Last Edit: 01/05/2009 15:27:58 by jpetruccelli »

#### The Naked Scientists Forum

##### Does light particles always follows Heisenberg Uncertainty Principle ?
« Reply #7 on: 01/05/2009 15:23:28 »