23456_diffraction and refraction of radio waves
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8/9/2019 23456_Diffraction and Refraction of Radio Waves
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Diffraction and Refraction ofRadio Waves
Learning Objectives:
All- Explain what long-distancecomm nication depends on!"ost- Explain how the refraction anddiffraction of radiation can affectcomm nications!#ome- Explain the advantage of digitalradio in terms of lac$ of interference
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#tarter Loo$ at the list of important events in the
field of comm nication and tr% to matchthem p with their inventor!
Extension- tr% to p t them in chronologicalorder
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"atch the &nventors with the&nvention ' ( )redit
Event Inventor
A invention of the telephone * + glielmo "arconi
, invention of television ( ans )hristian Oersted
) invention of a code consisting of a series of dots and
dashes. Alexander +raham ,ell
D the first person to s ggest the existence ofelectromagnetic waves / ,ill +ates
E the first transmission and reception of radio waves 0 &sambard 1ingdom,r nel
2 the first radio transmission from )ornwall to3ewfo ndland 4 5ames )ler$ "axwell
+ the prod ction of the first cell 6 5ohn Logie ,aird
a leader in the world of comp ters 7 einrich ert8
& the b ilding of the first transatlantic cable 9 #am el "orse
5 discover% of the magnetic effect of an electric c rrent * Alessandro ;olta
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Answers A. ,6 )9
D4 E7 2*
+* / &0
5(
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Diffraction of Radio Waves When long-wave signals meet an
obstr ction< li$e a hill< the% are diffracted
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