wave nature of matter
DESCRIPTION
Wave Nature of Matter. De Broglie Wavelength. Wave-particle duality apply also to matter. Early Models of Atoms. Thomson’s Model. Rutherford’s Model. Atomic Spectra. The Rutherford model, as it stood, was unable to explain why atoms emit line spectra. The Bohr Model. - PowerPoint PPT PresentationTRANSCRIPT
Wave Nature of Matter
De Broglie Wavelength
mv
h
Wave-particle duality apply also to matter.
Early Models of Atoms
Thomson’s Model
Rutherford’s Model
Atomic Spectra
The Rutherford model, as it stood, was unable to explain why atoms emit line spectra.
The Bohr Model
Bohr’s First Postulate
The angular momentum of electron is quantized.
Allowed Angular Momenta
2
hnLn
Allowed Radii
0
22
2
1
1
2
4
1
;4
k
mke
hr
rZ
nrn
Bohr’s Second Postulate
An electron doesn’t radiate when it is in one of the allowed orbits (stationary state).
Energy Levels of Atom
22
422 12
nh
eZEn
Bohr’s Third Postulate
A single photon is emitted whenever an electron jumps down from one orbit to another.
lowerupper EEhf
De Broglie’s Hypothesis Applied to Atoms