[simplified (OP)]

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)

[MikeS]

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

[simplified (OP)]

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?

[MikeS]

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.

[simplified (OP)]

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.

[simplified (OP)]

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.

[JP]

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.

[simplified (OP)]

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. )

[simplified (OP)]

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

[yor_on]

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.