True statements are (a) Electromagnetic waves do not require medium to move. (b) all type of electromagnetic radiations are same in wavelength. (c) In vacuum all electromagnetic radiations, travel at the same speed. (d) The oscillating electric & magnetic fields produced by oscillating charged particles are perpendicular to each other and both are perpendicular to the direction of propogation of the wave.

Step-by-step solution

- (a): Electromagnetic waves do not require a medium to move: This statement is true. Electromagnetic waves can propagate through a vacuum. (b): All types of electromagnetic radiations are the same in wavelength: This statement is not true. Electromagnetic radiation encompasses a wide range of wavelengths, from radio waves to gamma rays. (c): In vacuum, all electromagnetic radiations travel at the same speed: This statement is true. In a vacuum, all electromagnetic waves travel at the speed of light ( (c 3 10^8 ~m