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  4. SI unit of intensity of wave is

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Q. SI unit of intensity of wave is

Physical World, Units and Measurements

Solution:

$\text { Intensity of wave }=\frac{ { Energy }}{\text { Area } \times \text { Time }} $
$=\frac{J}{m^2 \times s}=W m^{-2}$
$\therefore$ The $S I$ unit of intensity of wave is $W m^{-2}$.