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Wave Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWave Optics1 Mark
MCQ
Electromagnetic waves travel in a medium which has relative permeability $1.3$ and relative permittivity $2.14.$ Then the speed of the electromagnetic wave in the medium will be
  • A
    $13.6 \times 10^6 m / s$
  • B
    $1.8 \times 10^2 m / s$
  • C
    $3.6 \times 10^8 m / s$
  • ✓
    $1.8 \times 10^8 m / s$
✓

Answer

Correct option: D.
$1.8 \times 10^8 m / s$
$v=\frac{c}{\sqrt{\mu_r \varepsilon_r}}=\frac{3 \times 10^8}{\sqrt{1.3 \times 2.14}}=1.8 \times 10^8 m / sec$

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