Which of the following is true for electromagnetic waves? (a) They have different speeds in vacuum for different frequencies. (b) They are longitudinal waves. (c) They do not require a medium for propagation. (d) None of the preceding is true.
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Electromagnetic waves are waves that are capable of transmitting energy through the vacuum of outer space. They are a combination of electric and magnetic fields that oscillate perpendicular to each other and the direction of wave propagation. Show more…
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