A charged particle moving at constant velocity will not create electromagnetic waves, but that same particle moving with a changing velocity (an acceleration) will create electromagnetic waves. Why? A.
Because electric forces and magnetic forces cancel out as a particle reaches a specific acceleration threshold.
B.
Because accelerating charges create changing electric fields, and the changing electric fields induce changing magnetic fields.
C.
Because only accelerating charges can repel their own electric fields, thus creating ongoing forward motion.
D.
Charged particles can accelerate only if they are in a vacuum, and since electromagnetic waves do not need a medium, they are created under vacuum conditions.

its C

Explanation:

My science teacher taught us this yesterday

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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