Electromagnetic radiation travels in wave form. All electromagnetic waves travel at the speed of 299.793 km/sec in a vacuum and very nearly the same speed in air. In quantum physics electromagnetic radiation is also described in terms of particles called photons whose energy is given by the equation E = hf where h is the Planck constant and f the frequency of corresponding wave. Electromagnetic wave propagation is fully described by the Maxwell Equations that unified in 1860s the laws of electricity and magnetism.
Describe Electromagnetic Waves in terms of Photons
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