A charged particle is oscillating in vacuum at a frequency of 1014Hz along x-axis E→ and B→ are the electric and magnetic field components of the wave radiated from the particle and C→ is the velocity of propagation. Then

Speed of radiation in vacuum C=3×108 m/s∴λ=Cν=3×108×10101014Ao=3×104AoThe electro magnetic radiation is propagating in all possible directions except along x-axis. At very large distance the wave becomes a plane wave. Since E→ and B→ are always perpendicular to the direction of propagation E→ can never be parallel to y-axis and B→ can never be parallel to x-axis.