What can you assume has happened if an electron moves to a higher energy level? a) the atom has become more stable
b) the electron has lost energy
c) the electron has gain energy
d) the atom has lost an electron

C) the electron has gain energy

Explanation:

electron can move to a higher energy level only if it gains energy by gaining energy photon. in this case atom becomes unstable. in order to loos the electron a minimum amount of energy required called work function. Here electron only moves to higher energy state so atom will come in the excited state and after loosing the same amount of energy atom comes back into the ground level.

falling water hydro = water .. spectcular places these plants are

the part of the wave he is travelling on is the crest