Discussion
Which one is not an example of electromagnetic wave ?
Answer: A
The one that is not an electromagnetic wave is Supersonic waves.
'Supersonic' describes motion faster than sound, and the waves meant are sound waves, which are mechanical waves. They need a material medium to travel through and cannot cross a vacuum.
Gamma rays, X-rays and ultraviolet rays are all parts of the electromagnetic spectrum. They are oscillating electric and magnetic fields that travel through a vacuum at the speed of light, differing only in wavelength: gamma rays shortest, then X-rays, then ultraviolet.
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