32. Electromagnetic Waves

What is an Electromagnetic Wave?

Astronomy - Ch. 5: Light & E&M Radiation (5 of 30) How Are E&M Waves Produced?

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Electromagnetic Waves


A <math display=“inline”><mrow><mrow><mn>50</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">W</mi></mrow></mrow></math> lightbulb emits light uniformly in all directions. What is the electric field amplitude <math display=“inline”><mrow><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow></mrow></math> away from the lightbulb?



What is the magnetic field amplitude of an electromagnetic wave that has electric field amplitude <math display=“inline”><mrow><mn>1500</mn><mtext>&#x00A0;</mtext><mtext>V/m</mtext></mrow></math>
?


Electromagnetic Waves - with Sir Lawrence Bragg

 Alice observes an electric field, <math display=‘inline’><mrow><mover accent='true'><mi>E</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>30</mn><mfrac><mi mathvariant="italic" class="MathML-Unit">V</mi><mi mathvariant="italic" class="MathML-Unit">m</mi></mfrac><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">k</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>, and a magnetic field <math display=‘inline’><mrow><mover accent='true'><mi>B</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>0.10</mn><mi mathvariant="italic" class="MathML-Unit">T</mi><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">i</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>. Bob is cruising by, with velocity <math display=‘inline’><mrow><mover accent='true'><mi>v</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>100</mn><mfrac><mi mathvariant="italic" class="MathML-Unit">m</mi><mi mathvariant="italic" class="MathML-Unit">s</mi></mfrac><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">j</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>, in Alice’s reference frame. What electric field does Bob observe?  

GCSE Physics - Electromagnetic Waves #64

Intro to Electromagnetic Waves (how EM waves are created, Poynting vector)

Anderson Video - How to Detect Electromagnetic Waves

Anderson Video - Electromagnetic Wave Example

Anderson Video - Electromagnetic Waves

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