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Another question is...How do you explain photoelectric effect? The phenomenon of emission of electrons from the surface of the metal when the light of suitable frequency falls on it is called the photoelectric effect. The ejected electrons are called photoelectrons. The current produced due to emitted electrons is called photocurrent. And for the last question..Give an idea about the properties and absorption spectra. This kind of spectrum is created by the frequencies of light that is transmitted with dark bands when energy is absorbed by the electrons generally in the ground state to reach higher energy level states. This is the kind of spectrum that is produced when atoms absorb energy. When light from any source is passed through the chemical solution, then a pattern comprising of dark lines is observed. This pattern is further analysed with the help of a spectroscope. So that would be all...thank you