An electromagnetic wave of frequency 5 GHz travels in a medium with relative permittivity 2 and relative permeability 2. If its speed is v×10⁷ m s⁻¹, find v.
Physics · Electromagnetic wave
JEE Mains

Question

An electromagnetic wave of frequency 5 GHz travels in a medium with relative permittivity 2 and relative permeability 2. If its speed is v×10⁷ m s⁻¹, find v.

G1 Physics · Accepted Answer

Wave speed in a medium is v=c/√(εᵣμᵣ). With εᵣ=2 and μᵣ=2, v=3×10⁸/2=1.5×10⁸ m s⁻¹=15×10⁷ m s⁻¹. Answer: 15.