An object is placed in a medium of refractive index $3$. An electromagnetic wave of intensity $6 \times 10^8 \mathrm{~W} / \mathrm{m}^2$ falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space $=3 \times 10^8 \mathrm{~m} / \mathrm{s}$ ):
A$36\ \mathrm{Nm}^{-2}$
B $18\ \mathrm{Nm}^{-2}$
C$6 \ \mathrm{Nm}^{-2}$
D $2\ \mathrm{Nm}^{-2}$
JEE MAIN 2024, Diffcult
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C$6 \ \mathrm{Nm}^{-2}$
c $ \text { Radiation pressure }=\frac{I}{V} $
$ =\frac{I \cdot \mu}{c} $
$ =\frac{6 \times 10^8 \times 3}{3 \times 10^8} $
$ =6 \mathrm{~N} / \mathrm{m}^2$
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