Which of the following is the best paraphrasing of the heisenberg uncertainty principle? which of the following is the best paraphrasing of the heisenberg uncertainty principle? only if you know the exact position of a particle can you know the exact momentum of the particle. the more precisely you know the position of a particle, the less well you can know the momentum of the particle. how well you can determine the position and momentum of a particle depends on the particle's quantum numbers. the larger the momentum of a particle, the smaller the position of the particle. the better you know the position of a particle, the better you can know the momentum of the particle.

The Heisenberg uncertainty principle was enunciated in 1927. It postulates that the fact that each particle has a wave associated with it, imposes restrictions on the ability to determine its position and speed at the same time.

In other words:  

It is impossible to measure simultaneously (according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle.  

In fact, even with the most precise devices, the uncertainty in the measurement continues to exist.  Thus, in general, the greater the precision in the measurement of one of these magnitudes, the greater the uncertainty in the measure of the other complementary variable.

uranium fissions/breaks up giving out energy and neutrons