An electromagnetic wave of frequency v = 3.0 MHz passes

• EM Waves

An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ∈ = 4.0. Then

1. wave length is double and frequency becomes half
2. wave length is double and the frequency remains unchanged
3. wave length is halved and frequency remains unchanged
4. wave length and frequency both remain unchanged

Answer

C ∝ 1/√ε  C → 1/2 ; as ε → 4

∴ C = nλ

λ becomes 1/2

n frequency remains unchanged

The correct option is C.