Answer:
1. To Enhanced Disinfection Reduces Risk of Germs Spreading
2. Atomic emission spectra are produced when excited electrons return to the ground state.
3. Planck made many contributions to theoretical physics, but his fame rests primarily on his role as originator of the quantum theory. This theory revolutionized our understanding of atomic and subatomic processes, just as Albert Einstein's theory of relativity revolutionized our understanding of space and time.
¤(understanding of the particle nature of light.) -The emission of free electrons from a metal surface when the light is shone on it, it is called the photoemission or the photoelectric effect. This effect led to the conclusion that light is made up of packets or quantum of energy.
