Transcription of UNIT 2 THE ELECTROMAGNETIC SPECTRUM - NASA
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UNIT 2 THE ELECTROMAGNETIC SPECTRUM - NASA
Like expanding ripples in a pond after a pebblehas been tossed in, ELECTROMAGNETIC radiationtravels across space in the form of waves. Thesewaves travel at the speed of light 300,000 kilo-meters per second. Their wavelengths, the dis-tance from wave crest to wave crest, vary fromthousands of kilometers across (in the case ofthe longest radio waves) to fractions of ananometer, in the cases of the smallest x-raysand gamma rays. ELECTROMAGNETIC radiation has properties of bothwaves and particles. What we detect depends on themethod we use to study it. The beautiful colors thatappear in a soap film or in the dispersion of lightfrom a diamond are best described as waves. Thelight that strikes a solar cell to produce an electriccurrent is best described as a particle. Whendescribed as particles, individual packets of electro-magnetic energy are called photons.
other. It is called the electromagnetic spectrum because this radiation is associat-ed with electric and magnetic fields that transfer energy as they travel through space. Because humans can see it, the most familiar part of the electromagnetic spectrum is visible light—red, orange, yellow, green, blue, and violet. UNIT 2 THE ELECTROMAGNETIC ...
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