Word Count : 215

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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 __________ _____ _______ ______ _________ __________ ___ _________ ____ __________ ___.
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