First slide

Physical quantities and units

Question

SI unit of intensity of wave is

Easy

A

$J m^{- 2} s^{- 1}$
B

$J m^{- 1} s^{- 2}$
C

$W m^{- 2}$
D

$J m^{- 2}$

Solution

Intensity (I) = $\frac{E n e r g y}{A r e a \times T i m e} = \frac{J}{m^{2} s}$

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