the speed of light is the right answer
Below are the choices that can be found in the other sources:
A. diffraction
<span>B. refraction </span>
<span>C. reflection </span>
<span>D. transmission
</span>
The answer is diffraction. It means that <span>the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.</span>
Coulomb's law, or Coulomb's opposite square law, is a trial law of material science that measures the measure of power between two stationary, electrically charged particles. The electric power between charged bodies very still is customarily called electrostatic power or Coulomb power.
The half life is 20 mins since it takes 20 mins for it to be half of what it was before
45) B) Vaporizing water at its boiling point
46) D) There is no change in temperature
47) B) Molecules must be pulled apart
48) D) Steam at 100 C
Hope this helps!