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JEE Main 2024 (27 Jan, Shift 2) · Momentum & Radiation Pressure

Momentum & Radiation Pressure question from JEE Main 2024 (27 Jan, Shift 2)

Q5JEE Main 2024 · 27 JAN · SHIFT 2Medium

Momentum & Radiation Pressure

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

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Answer: (a)

In a medium the wave speed is $v = c/n = 10^8\ \text{m/s}$
For complete absorption, pressure $= \dfrac{I}{v} = \dfrac{nI}{c}$
$P = \dfrac{3 \times 6 \times 10^8}{3 \times 10^8} = 6\ \text{N m}^{-2}$
So the answer is (a).

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