Inertial Frame (or Inertial System):
A reference frame in which the observers are not subject to any accelerating force. An inertial frame is a frame of reference in which a body remains at rest or moves with constant linear velocity unless acted upon by outside forces (as stipulated by Sir Isaac Newton’s First Law of Motion, Force = MassCH Acceleration). Any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system.
Interference:
The ability of two waves passing through each other to mingle, reinforcing each other where crests coincide and cancelling each other out where crests and troughs coincide, similar to the way ripples in water interfere with each other. This results, for example, in an interference pattern of light and dark stripes on a screen illuminated by light from two sources.
Ion:
An atom or molecule that has been stripped of one or more of its orbiting electrons, thus giving it a net positive electric charge. Technically, an atom which gains an electron (thus giving it a net negativeelectric charge) is also a type of ion, known as an anion.
Isotope:
A possible form of an element, distinguishable from other isotopes of the same element by its differingmass, which is caused by a different number of neutrons in the nucleus (the number of protons, which gives the atomic number of the element, must be the same). Around 75% of isotopes are stable, while some are unstable or radioactive, and will decay over time into other elements.
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