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20 June, 05:58

Which of the following is a true statement? A. Electromagnetic waves consist of only changing electric fields. B. Electromagnetic waves are longitudinal waves. C. Electromagnetic waves do not always need a medium to travel. D. Electromagnetic waves can vary in speed, wavelength and frequency.

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  1. 20 June, 06:09
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    C. Electromagnetic waves don't always need a medium to travel. Note that they do vary in wavelength and frequency however their speed is fixed. Also, EM waves are always transverse and they consist of vibrating electric and magnetic fields.
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