What does the atomic mass of an atom tell us? how much the atom weighs the number of electrons in the atom which row the element is in on the periodic table the number of energy levels in the atom

If you were on a jury, do you think you would expect individual characteristics in the evidence? why or why not? what effects might it have if individuals expect to have individuals characteristics presented? this question is for forensic science

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

What is reflection, what is refraction, and what is diffraction. what some similarities or differences between the three.