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Physics Dictionary
R
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| radar | |
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| radian | |
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| radiant heat | |
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| radiation | |
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| radiator | |
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| radio astronomy | |
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| radio telescope | |
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| radioactive chain | |
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| radioactive decay | |
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| radioactive dust | |
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| radioactive fallout | |
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| radioactive substance | |
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| radioactive waste | |
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| radioactivity | |
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| radioisotope | |
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| radium (Ra) | |
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| radius of curvature | |
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| radon (Rn) | |
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| rainbow | |
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| random error | |
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| range | |
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| rarefaction, region of | |
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| ray box | |
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| reactance | |
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| real depth | |
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| real image | |
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| recoil | |
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| rectification | |
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| rectifier | |
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| red giant | |
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| red shift | |
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| reference point | |
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| reflected ray | |
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| reflected wave | |
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| reflecting telescope | |
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| reflection | |
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| reflection, angle of | |
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| reflection, law of | |
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| refracted ray | |
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| refracted wave | |
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| refracting angle | |
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| refracting telescope | |
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| refraction | |
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| refraction, angle of | |
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| refraction, law of | |
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| refractive index | |
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| refrigerator | |
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| refrigerant | |
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| regular reflection | |
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| relative motion | |
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| relative permeability | |
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| relative permittivity | |
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| relative velocity | |
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| relativity | |
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| relativity, principle of | |
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| resistance (R) | |
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| resistance thermometer | |
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| resistivity (
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| resistor | |
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| resolution | |
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| resolution of a vector | |
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| resonance | |
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| resonant frequency | |
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| rest mass | |
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| restoring force | |
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| resultant force | |
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| resultant vector | |
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| retardation | |
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| rheostat | |
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| right hand rule | |
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| rigid body | |
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| ripple tank | |
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| root-mean-square value (rms) | |
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| rotational equilibrium | |
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| rotational harmonic motion | |
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| rotational inertia | |
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| rotational motion | |
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| rudder | |
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