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Modern Physics

Across
An experiment dealing with twins.
The merging of two atoms.
A difference of elapsed time between two events.
A demonstration that light and matter can display characteristics of both waves and particles
The opposite of a Neutrino.
The principle of being uncertain.
The process by which an unstable atomic nucleus loses energy.
The time taken for the radioactivity of a specified isotope to fall to half its original value.
When you do one thing and other things happen because of it.
An element with more neutrons than protons.
When an atom splits.
The opposite of matter.
Down
Effect that leads to the emission of photoelectrons from matter when light (photons) shines upon them.
A discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
The green glow off nuclear waste.
A neutral particle.
An electron emitted by radioactive decay.
A helium nucleus that is emitted by radioactive means.
A photon of electromagnetic radiation.
The dependence of various physical phenomena on relative motion of the observer and the observed objects.
The first part of a two part video game series released in November 8, 1998.
A particle representing a quantum of light or other electromagnetic radiation.