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Online Physics Glossary
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Word Meaning Remarks
Principal axis Line connecting center of curvature of spherical mirror with its geometric vertex. Line perpendicular to plane of lens passing through its center.
Principle of superposition Displacement due to two or more forces is equal to vector sum of forces.
Projectiles Motion of objects given initial velocity that then move only under force of gravity.
Proton Subatomic particle with positive charge that is nucleus of hydrogen atom.
Quantized A quantity that cannot be divided into smaller increments forever, for which there exists a minimum, quantum increment.
Quantum mechanic Study of properties of matter using its wave properties.
Quantum model of atom Atomic model in which only probability of locating electron is known.
Quantum number Integer ratio of energy to its quantum increment.
Quark Basic building block of protons, neutrons, other baryons, and mesons.
Quark model Model in which all particles that interact via the strong interaction are composed of two or three quarks.
Radiation Electromagnetic waves that carry energy.
Radioactive decay Spontaneous change of unstable nuclei into other nuclei.
Radioactive materials Materials that undergo radioactive decay.
Range of projectile Horizontal distance between launch point of projectile and where it returns to launch height.
Ray model of light Light may be represented by straight line along direction of motion.
 
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