Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?

Which of the following is/are the property/properties of a monochromatic electromagnetic wave propagating in the free space? 1. Electric and magnetic fields will have a phase difference pi/2. 2. The energy of the wave is distributed equally between electric and magnetic fields. 3. The pressure exerted by the wave is the product of its speed and energy density. 4. The speed of the wave is equal to the ratio of the magnetic field to the electric field

The speed of electromagnetic waves in free space is

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following has/have zero average value in a plane electromagnetic wave?

Which of the following has/have zero average value in a plane electromagnetic wave?

The speed of electromagnetic waves in free space is _____ m/s.