Question
The sodium lamp used in a physics laboratory gives out light uniformly. Suppose that the lamp uses 40 W. Calculate the magnitude of electric field.
Answer :
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To calculate the magnitude of the electric field from the sodium lamp, we need to relate the power of the lamp to the intensity of the emitted light and then to the electric field. A sodium lamp emitting light uniformly can be modeled as radiating power (P = 40\ \text{W}) equally in all directions. The intensity (I) at a distance (r) from the lamp is given by the formula: [ I = \frac{P}{4 \pi r^2} ] where (P) is the total power and (r) is the distance from the lamp. The intensity of an electromagnetic wave is
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