Lecture 2110/24/05. Light Emission vs. Absorption Black body.

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Presentation transcript:

Lecture 2110/24/05

Light Emission vs. Absorption Black body

Dual Nature of Light Wave Refraction Diffraction Particle Photoelectric effect

Line Emission Spectrum “Excited” atoms emit light

Line Emission Spectrum

Balmer series Rydberg equation Balmer Series

Atomic Spectra and Bohr 1. 1.Any orbit should be possible and so is any energy. 2.But a charged particle moving in an electric field should emit energy. Electron would eventually run out of energy

Bohr New theory : Quantum or Wave Mechanics e- can only exist in certain discrete orbits Stationary states e- is restricted to QUANTIZED energy states.

n= principal quantum number n is an integer n with the lowest possible energy is said to be in the ground state Electrons with higher energy than ground state are said to be in an excited state

Calculate the energies of n=1, n=2, and n=3 states of the hydrogen atom in J/atom. R = x 10 7 m -1 h = x J-s c = x 10 8 m/s