Physics for IGCSE & O level - Rays And Waves (Section 4 - No. 49)
Which of the following is a property of all electromagnetic waves?
They require a medium to travel.
They travel at the same speed in a vacuum.
They are longitudinal waves.
They are not affected by electric or magnetic fields.
הֶסבֵּר
All electromagnetic waves travel at the same speed in a vacuum.