True
For the reason is that when an excited electron jump to a higher energy state,it absorbs energy,and when it drop to a lower available energy state,it emits energy.The form of energy is photon.We call it "hv".
True
For the reason is that when an excited electron jump to a higher energy state,it absorbs energy,and when it drop to a lower available energy state,it emits energy.The form of energy is photon.We call it "hv".