单词	electromagnetic spectrum
释义	electromagnetic spectrum The range of wavelengths over which electromagnetic radiation extends. The longest waves (105-10-3 metres) are radio waves, the next longest (10-3-10-6 m) are infrared waves, then comes the narrow band (4-7 × 10-7 m) of visible light, followed by ultraviolet waves (10-7-10-9 m), X-rays (10-9-10-11 m), and gamma rays (10-11-10-14 m).
随便看	analytical geometry anastigmatic lens and circuit Anderson, Carl David anechoic anemometer aneroid barometer angle modulation angle of incidence angle of reflection angle of refraction angstrom Angström, Anders Jonas angular displacement, velocity, and acceleration angular frequency angular magnification angular momentum anharmonic oscillator anion anisotropic annealing annihilation annulus anode anomaly

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