Answer:
640 nanometer setara dengan 6.4e-7 meter
Your answer will be Radio Waves .
That seems to be the only to make sense. Hope that helps u
Answer: n = c / v" "c" is the speed of light in a vacuum, "v" is the speed of light in that substance and "n" is the index of refraction. According to the formula, the index of refraction is the relation between the speed of light in a vacuum and the speed of light in a substance.
Explanation: the relation is the vacuum and the speed of light in a substance.
Voltage - V = IR : v= voltage i= current r= resistance
Academic- affect on substances, how it works
Scientific- helping cancer, making weapons
