32. Electromagnetic Waves

Energy Carried by Electromagnetic Waves

Energy Density of Electromagnetic Waves (Light) | Doc Physics

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 At one instant, an electromagnetic wave has a Poynting vector in the positive x direction and a magnetic field in the negative z direction. What is the direction of the electric field? 

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21.4 Energy, Power, and Intensity of Electromagnetic Waves

The Energy Carried by Electromagnetic Waves

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What is the average magnitude of the Poynting vector for an electromagnetic wave with magnetic field amplitude equal to <math display='inline'><mrow><mn>45</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">nT</mi></mrow></math>?

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

Intensity = 318 W/m2; Electric field intensity = 489 N/C; Magnetic field intensity = 1.63μT

Intensity = 7958 W/m2; Electric field intensity = 2448 N/C; Magnetic field intensity = 8.16μT

Intensity = 31830 W/m2; Electric field intensity = 4897 N/C; Magnetic field intensity = 16.3μT

Intensity = 7958 W/m2; Electric field intensity = 2448 N/C; Magnetic field intensity = 2.17 μT

A 100 W lightbulb actually emits around only 10 W of light. What is the intensity of the light 1 cm away if the light is emitted perfectly spherically? What is the magnitude of the electric field emitted by the lightbulb? What about the magnetic field?

phys2B ch24.4 The Energy Carried by Electromagnetic Waves

Suppose a certain star has a temperature of <math display=“inline”><mrow><mn>7000</mn><mtext>&#x00A0;</mtext><mi mathvariant="normal">K</mi><mo>.</mo></mrow></math> At what wavelength will this star emit the most energy?

Energy Density of Electromagnetic Waves

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