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Rocket Propulsion
- reaction propulsion using stored oxygen for combustion; used where there is insufficient atmospheric oxygen
- reaction propulsion using stored oxygen for combustion; used where there is insufficient atmospheric oxygen
Reaction Propulsion
- propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
- propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
Radiant Energy
- energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
- energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
Radio Wave
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
Radio Emission
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
Radio Radiation
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
- an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
Radio Signal
- a radio wave used to transmit and receive messages
Radio Spectrum
- the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
- the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
Radio-Frequency Spectrum
- the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
- the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television
Rainfall
- water falling in drops from vapor condensed in the atmosphere