A student investigating the photoelectric effect attempts to measure the kinetic energy of electrons emitted from the surface of a metal irradiated by laser light with photon energy hv= 2.55 eV. The work function of the metal is known to be $ = 2.90 eV. What is the outcome of the experiment? No electrons are emitted. Electrons are emitted with a kinetic energy of 0.35 eV. Electrons are emitted with a kinetic energy of 2.55 eV. Electrons are emitted with a kinetic energy of 5.45 eV. Electrons are emitted with a kinetic energy of 2.90 eV.

Q: E4   =   −1.0 × 10−19  J   E3   =   −5.0 ×10−19  J   E2   =   −1.0 × 10−18  J   E1   =   −1.5 ×…

A: Wavelength is related to energy by the following formula : E  = h.Cλwhere λ = wave lengthE = energyh…

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.