Ultraviolet light is incident normally on the surface of a certain substance. The binding energy of the electrons in this substance is 3.29 eV. The incident light has an intensity of 0.044 W/m2. The electrons are photoelectrically emitted with a maximum speed of 5.2x105 m/s. Assume the absorption of every photon ejects an electron. (c) Determine the total energy required to both eject the electron and give it a velocity of 5.2x105 m/s. (e) Determine the number of electrons ejected from 1 cm2 area in 1 s.

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.