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What is difference between electro-magnetic radiation & electro-magnetic wave ?

shroff_rushi

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In radio frequency communication & other wireless communication systems we use electro-magnetic waves associated with antenna & transmission lines.
In spectroscopy we have UV-Visible electro-magnetic radiation. Generated by black body radiator tungsten lamp or halogen lamp.

we have electro-magnetic spectrum.

ems.jpg


My question is 'What is difference between electro-magnetic radiation & electro-magnetic wave'..? Are they same ?? How to generate electro-magnetic waves with particular shaping ?
 

Aussie Susan

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The electro-magnetic waves radiate from the source.
As for creating electro-magnetic waves with a particular shaping, I can think of two interpretations of this: one is to use an antenna to generate a radiation pattern of a given shape (e.g. a directional antenna) or the shape of the wave itself (e.g. amplitude modulation).
Susan
 

c_mitra

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alpha and beta particles are not electromagnetic radiations; they are helium nucleus and electron respectively. Otherwise electromagnetic waves and electromagnetic radiation are the same thing.
 

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