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Solution
(a) Electromagnetic waves sustain electric charges in motion by their electric field and magnetic field. So the charges acquire energy from the waves. Also, an electromagnetic wave exerts pressure, called radiation pressure. This pressure is due to the momentum. Hence they are said to transport momentum.
(b) All these absorb ultraviolet(UV) rays.
(c) The speed of an electromagnetic wave in a material medium in terms of the electric and magnetic properties of the medium is
v=1μ  where μ=permeability of the medium and = permittivity of the medium.
the ratio of the speed of EM wave in material medium and vacuum =μ0μ0.
 

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