Electromagnetic waves consist of
- A. vibrating particles of a medium
- B. oscillating electric and magnetic fields at right angles to each other and to the direction of travel
- C. a stream of charged particles
- D. longitudinal compressions and rarefactions
Explanation
A changing electric field generates a magnetic field and vice versa, so the two sustain each other and the wave propagates without needing any medium, which is why light crosses empty space. Being transverse, electromagnetic waves can be polarised. All of them travel at 3 times 10 to the 8 metres per second in a vacuum.
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