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	Doppler effect dose dosimeter dot product double refraction doublet drain drift-tube accelerator dry cell dry ice duality dubnium ductility Dulong and Petit's law dust core dwarf star dynamic equilibrium dynamical system dynamics dynamo dynamo action dynamometer dyne dystectic mixture e

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