R
- radar
- radar astronomy
- radar cross section
- radar gun
- radio propagation
- radio waves
- Radiosity (heat transfer)
- Rayleigh–Jeans law
- Rayleigh scattering
- Rayleigh wave
- Rayleigh–Jeans law
- redshift
- reflection coefficient
- reflection seismology
- refraction
- relativistic Doppler effect
- resonance
- Resonator
- Ring laser gyroscope
- ring modulation
- ring wave guide
- rip current
- ripple
- ripple tank
- rogue wave (oceanography)
- Rossby-gravity waves
- Rossby wave
- Rydberg constant
- Rydberg formula
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