As humans, we can only perceive a small amount of the light in the Universe, called Visible Light. Why? Also, why can we see the light that we and other humans emit?

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

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