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INTRODUCTION The Electromagnetic Spectrum

I 1I. What is Electromagnetic radiation and theelectromagnetic Spectrum ?What do light, X-rays, heat radiation, microwaves, radio waves, and gamma radiationhave in common? Despite their differences, they are all the same kind of stuff. They alltravel through space and have similar electrical and magnetic effects on matter. This stuff is called Electromagnetic radiation, because it travels (radiates) and has electrical andmagnetic radiation is the means for many of our interactions with the world: lightallows us to see; radio waves give us TV and radio; microwaves are used in radar commu-nications; X-rays allow glimpses of our internal organs; and gamma rays let us eavesdropon exploding stars thousands of light-years away.

INTRODUCTION The Electromagnetic Spectrum Fig. 1. The electromagnetic spectrum. Human Eye Response {increasing increasing decreasing decreasing decreasing increasing ENERGY frequency wavelength Cosmic and gamma rays X-rays Ultraviolet Lght …

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