The amplitude of a wave is most directly related to what wave characteristic? crest length frequency wavelength wave height

The amplitude of a wave is most directly related to crest length.

Amplitude means the height of a crest or a trough.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.