NIELS BOHR. BOHR’S LIFE AND HIS WORKS. WHEN AND WHERE WAS OUR SCIENTIST BORN? WHAT EXPERIMENTS DID OUR SCIENTIST DO? HOW DID SUCH EXPERIMENTS HELP IMPROVEMENT OF ATOMC MODEL? HOW DID OUR SCINETIST’S FINDINGS HELP ADVANCEMENT OF OUR
As the son of ChristianBohr, professor of physiology at Copenhagen University.
His mother came from a family distinguished in the field of education.
In1903, he entered Copenhagen University
His Master's degree in Physics in 1909 and his Doctor's degree in 1911.
The award of the Nobel Prize for 1922.
WHEN AND WHERE WAS OUR SCIENTIST BORN?
Determination of the surface-tension of water by the method of jet vibration
Manchester in March 1912 and joined Ernest Rutherford's group studying the structure of the atom.
Bohr was among the first to see the importance of the atomicnumber.
Rutherford's nuclear atom was both mechanically and electromagnetically unstable, but Bohr imposed stability on it by introducing the new and not yet clarified ideas of the quantum theory being developed by Max Planck, Albert Einstein, and other physicists. Departing radically from classical physicsHOW DID SUCH EXPERIMENTS HELP IMPROVEMENT OF ATOMC MODEL?
1) Electrons assume only certain orbits around the nucleus. These orbits are stable and called "stationary" orbits.
2) Each orbit has an energy associated with it. For example the orbit closest to the nucleus has an energy E1, the next closest E2 and so on.
3) Light is emitted when an electron jumps from a higher orbit to a lower orbit and absorbed when it jumps from a lower to higher orbit.
4) The energy and frequency of light emitted or absorbed is given by the difference between the two orbit energies, e.g.,
E(light) = Ef - Ei
n = E(light)/h
h= Planck's constant = 6.627x10-34 Js
where "f" and "i" represent final and initial orbitsThe Bohr model consists of fourprinciples
Bohr postulated that Electrons move around the nucleus in “circular orbits” with an angular momentum, mvr,given by
m = mass of e-
v = velocity of e-
r = radius of orbit
h = Planck’s constant
n = principle quantum number.
This description of atomic structure is known as the Bohr atomic model.