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Online Physics Glossary
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Word Meaning Remarks
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.
Ray optics Study of light using ray model.
Rayleigh criterion Two optical images are separable if central bright spot of one image falls on first dark band of second.
Real image Optical image at which rays from object converge.
Receiver Device that detects electromagnetic waves.
Reference level Location at which potential energy is chosen to be zero.
Reference point Zero location in a coordinate system or frame of reference.
Refraction Change in direction of light ray when passing one medium to another.
Refractive index Ratio of speed of light in vacuum to that in the medium.
Resistance Ratio of potential difference across device to current through it.
Resistance force Force exerted by a machine.
 
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