The first estimation of the speed of light was based on observing
lanterns
the moons of jupiter
a rotating octagonal mirror
a lightbulb

Why do electron microscopes have higher resolving power than light microscopes?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.