Question

The electric field associated with an e.m. wave in vacuum is
given by E ⃗ = iˆ 40 cos (kz – 6 × 10⁸t), where E, z and t are in
volt/m, meter and seconds respectively. The value of wave
vector k is
(a) 2 m⁻¹ (b) 0.5 m⁻¹
(c) 6 m⁻¹ (d) 3 m⁻¹

Answer 1

Answer:

I thought c option is correct answer

Answer 2

Answer:

3m

.,,.,.,..,,,.,,.,.,,....,,

Explanation:

kk