Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: simplified on 02/02/2012 16:23:27

Title: Does time define distribution of energy of recoils?
Post by: simplified on 02/02/2012 16:23:27

For example I am in free space.I have an ability to radiate a trillion identical photons.In what case I receive more kinematic energy:1) if I radiate all the photons simultaneously
            2)if I radiate all the photons in current of one second.
            3)if I radiate all the photons in current of one day ?
(I radiate all the photons in one direction)

Title: Re: Does time define distribution of energy of recoils?
Post by: MikeS on 03/02/2012 07:21:19

I would have thought it would have been the same.  x amount of energy converts to x amount of kinetic energy.

Title: Re: Does time define distribution of energy of recoils?
Post by: simplified on 03/02/2012 13:30:01

Quote from: MikeS on 03/02/2012 07:21:19

I would have thought it would have been the same.  x amount of energy converts to x amount of kinetic energy.

Do I or the photons recieve this kinetic energy?

Title: Re: Does time define distribution of energy of recoils?
Post by: MikeS on 03/02/2012 13:58:54

You do but you used the same amount of energy in the first place to generate the photons.
I imagine you probably used a little more as the photons carry away a certain amount of energy.

Title: Re: Does time define distribution of energy of recoils?
Post by: simplified on 03/02/2012 14:21:34

Quote from: MikeS on 03/02/2012 13:58:54

You do but you used the same amount of energy in the first place to generate the photons.
I imagine you probably used a little more as the photons carry away a certain amount of energy.

I want to take more energy of the photons for my motion.Therefore I ask the my  question. :P

Title: Re: Does time define distribution of energy of recoils?
Post by: simplified on 04/02/2012 09:37:19

And so photons's engine can be very effective if spaceship radiates very powerful flow of photons and the spaceship should have small mass(then the photons lose much energy). Such acceleration can be safe far from big masses.

Title: Re: Does time define distribution of energy of recoils?
Post by: JP on 04/02/2012 14:41:09

Yeah, you can use photons as an engine: http://en.wikipedia.org/wiki/Photon_rocket

The drawback is that creating photons and getting them all to go in the right direction is difficult.

Title: Re: Does time define distribution of energy of recoils?
Post by: simplified on 04/02/2012 15:47:44

Quote from: JP on 04/02/2012 14:41:09

Yeah, you can use photons as an engine: http://en.wikipedia.org/wiki/Photon_rocket

The drawback is that creating photons and getting them all to go in the right direction is difficult.

Thanks. Can we keep  many photons in a mirror box?

I thought a fast radiation of the photons gives additional energy(relatively of slow radiation) for me,but it's not true. :o)

Title: Re: Does time define distribution of energy of recoils?
Post by: simplified on 08/02/2012 15:59:20

Сan a mirror ring be a storehouse of  traveling photons (inside this mirror ring)?

Title: Re: Does time define distribution of energy of recoils?
Post by: yor_on on 09/02/2012 01:15:19

Only if you find a way to make them 'perfectly reflecting'. And I don't think that's possible. Then you have the idea of the vacuums 'potential energy' of course. If you found a way of tapping that energy and focus it into a beam, you would get a propagation.