Black hole can regard as most efficency mass-energy convecter?

[magnetar]

Black hole can regard as most efficency mass-energy converter?

With black hole and hawking radiation's help, i come up with an idea to convert my apple completely into pure energy without another antimatter apple

I throw my apple into a black hole , eventually my apple will convert into hawking radiation—pure energy(particle and antiparticle will annihilate each other into photons).

The net result is my apple completely convert into pure energy!

 

[clamtrox]

The energy you get out of Hawking radiation is hardly 'pure' since it's pretty much as useless energy as you can find. For example, a human can easily use a fraction of the energy stored in an apple by eating it, but there's absolutely no way to build a machine which could utilize ANY energy stored in extremely cold thermal radiation.

 

[HallsofIvy]

And the correct word is "convert", not "convect".

 

[magnetar]

Here is an article talking about "Black Hole Drive Could Power Future Starships"
http://www.universetoday.com/2009/11/19/black-hole-drive-could-power-future-starships/
http://arxiv.org/abs/0908.1803v1