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STANDARD Physics Velocity of Light in Medium MCQ Question

Type: MCQ-conceptual-Medium-Class 12

For a transparent medium relative permeability and permittivity, μᵣ and εᵣ are 1.0 and 1.44 respectively. The velocity of light in this medium would be

A

2.5 × 10⁸ m/s

B

3 × 10⁸ m/s

C

2.08 × 10⁸ m/s

D

4.32 × 10⁸ m/s

Correct Answer

Option A

Detailed Explanation

Given, relative permittivity, εᵣ = 1.44 and relative permeability, μᵣ = 1. Now, as we know that, ε = εᵣε₀ and μ = μᵣμ₀. Velocity of light in the medium will be, v = 1/√(μᵣμ₀εᵣε₀) = c/√εᵣ = 3 × 10⁸/√1.44 = 2.5 × 10⁸ m/s.

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