Answer:
1.The use of ultraviolet light systems is becoming more widely used in healthcare facilities for disinfecting patient and operating rooms. Yet, ultraviolet lights systems are misunderstood in spite of significant research and use in other industries.
2.-When atoms are excited they emit light of certain wavelengths whichcorrespond to different colors. These specific frequencies of light can beobserved as a series of colored lines called a line or atomic spectra.
3.Planck postulated that the energy of light is proportional to the frequency, and the constant that relates them is known as Planck's constant (h). His work led to Albert Einstein determining that light exists in discrete quanta of energy, or photons.
