what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
when light ( em ) waves is emitted
from an atom,an electron in an atom
have returned to its ground state from excited energy state( higher energy
level),according tobohr atomic 2nd postulates.
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