32. Electromagnetic Waves
Energy Carried by Electromagnetic Waves
Multiple Choice
Multiple ChoiceA 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?
A
Intensity = 318 W/m2; Electric field intensity = 489 N/C; Magnetic field intensity = 1.63μT
B
Intensity = 7958 W/m2; Electric field intensity = 2448 N/C; Magnetic field intensity = 8.16μT
C
Intensity = 31830 W/m2; Electric field intensity = 4897 N/C; Magnetic field intensity = 16.3μT
D
Intensity = 7958 W/m2; Electric field intensity = 2448 N/C; Magnetic field intensity = 2.17 μT
8:18m
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