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Q. The $SI$ unit of intensity of wave is

UP CPMTUP CPMT 2012

Solution:

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