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8. Electromagnetic waves — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics8. Electromagnetic waves1 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.
$1.8 \times {10^8}\,m/s$
d
(d)$v = \frac{c}{{\sqrt {{\mu _r}{\varepsilon _r}} }} = \frac{{3 \times {{10}^8}}}{{\sqrt {1.3 \times 2.14} }} = 1.8 \times {10^8}m/sec$

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