An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity falls normally on the object and it is absorbed completely. The radiation pressure on the object would be

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Solution

Q.
An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity $6 \times 10^{8} W / m^{2}$ falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space $= 3 \times 10^{8} m / s$ ) [2024]

1 $36 N m^{- 2}$

2 $18 N m^{- 2}$

3 $6 N m^{- 2}$

4 $2 N m^{- 2}$

Ans.
(3)

$Radiation pressure = \frac{I}{V}$

$= \frac{I \cdot μ}{c} = \frac{6 \times 10^{8} \times 3}{3 \times 10^{8}} = 6 {N / m}^{2}$

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