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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The power of the sodium lamp is given as ( P = 40,\text{W} ). For an electromagnetic wave, the time-averaged intensity ( I ) is related to the magnitude of the electric field ( E ) by: [ I = \frac{1}{2} c \varepsilon_0 E^2 ]
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