The energy generated from the splitting of the atom
(though nuclear fusion would later add further possibilities).
The Bohr model stabilized Rutherford's original picture
by showing that the atom could exist only in discrete energy states.
In light of the indeterminacy set forth by Heisenberg's uncertainty
principle, the principle of complementarity argues that two answers
are preferable to one when neither is itself complete.
A temporary excited state of the nucleus that occurs
upon the collision of two particles. Bohr postulated that the nucleus
might discharge this excess energy through the emission of radiation.
Founded and headed by Bohr, this Institute soon became
the world center for modern physics. Here Bohr cultivated new generations
of physicists, while hosting colloquia that would repeatedly alter
the course of history.
This principle states that a new theory must be applicable
to all phenomena for which a preceding theory was valid. It applies particularly
to theories at the atomic level, which had to be evaluated against
traditional phenomena as well, since classical physics had successfully
A theoretical model proposed by Bohr that compares
the nucleus to a drop of liquid. This model would later have consequences for
the discovery of fission.
A nuclear reaction in which the nucleus of an atom,
usually uranium, is split into two fragments, leading to the release
of a great deal of energy.
A theory that addresses the duality of matter and energy,
which have the properties of both particles and waves. In creating
his atomic model, Bohr specifically applied Planck's idea that energy
consists of discrete packets called quanta.
A state of an atomic system that has a defined energy
level associated with it.
Formulated by Heisenberg, this principle states that
the velocity and position of an electron can never be exactly determined, since
the act of measurement necessarily disturbs the conditions.