June 29, 2016 Wednesday
Post attack day 7
Geiger then decided to go more precise.
He had to device an experiment or apparatus which would give him accurate angles of deflection of the alpha particles.
He constructed an air tight glass tube from which air was sucked out.
At one end was a bulb B containing radon-222 (atomic number 86 noble gas), the source of alpha particles.
Using mercury, the radon in the bulb B was pushed up whose end was plugged with mica A.
At the other end of the tube was the fluorescent zinc sulphide screen S.
The microscope that he used to count the scintillations on the screen was affixed with a vernier vertical scale.
This allowed Geiger to precisely measure and calculate the particles' angles of deflection.
The alpha particles emitted from A was narrowed to a beam by a small circular hole at D.
Further at point E he placed metal foils of different metals to see how the scintillating points behave.
He could also vary the velocity of the alpha particles by placing extra sheets of mica or aluminium at A.
From these experiments, Geiger came to the following conditions:
1. The most probable angle of deflection increases with the thickness of material.
2. The most probable angle of deflection is proportional to the atomic mass of the substance.
3. The most probable angle of deflection decreases with the velocity of the alpha particles.
4. The probability that a particle will be deflected by more than 90° is vanishingly small.
This entire experiment with its conclusions was published as a paper titled:
"The scattering of the alpha particles by matter"
In 1910.
Stay tuned to the voice of the storytelling chimpanzee or
login at http://panarrans.blogspot.in/
Good night mon ami and my fellow cousin ape.
Post attack day 7
Geiger then decided to go more precise.
He had to device an experiment or apparatus which would give him accurate angles of deflection of the alpha particles.
He constructed an air tight glass tube from which air was sucked out.
At one end was a bulb B containing radon-222 (atomic number 86 noble gas), the source of alpha particles.
Using mercury, the radon in the bulb B was pushed up whose end was plugged with mica A.
At the other end of the tube was the fluorescent zinc sulphide screen S.
The microscope that he used to count the scintillations on the screen was affixed with a vernier vertical scale.
This allowed Geiger to precisely measure and calculate the particles' angles of deflection.
The alpha particles emitted from A was narrowed to a beam by a small circular hole at D.
Further at point E he placed metal foils of different metals to see how the scintillating points behave.
He could also vary the velocity of the alpha particles by placing extra sheets of mica or aluminium at A.
From these experiments, Geiger came to the following conditions:
1. The most probable angle of deflection increases with the thickness of material.
2. The most probable angle of deflection is proportional to the atomic mass of the substance.
3. The most probable angle of deflection decreases with the velocity of the alpha particles.
4. The probability that a particle will be deflected by more than 90° is vanishingly small.
This entire experiment with its conclusions was published as a paper titled:
"The scattering of the alpha particles by matter"
In 1910.
Stay tuned to the voice of the storytelling chimpanzee or
login at http://panarrans.blogspot.in/
Good night mon ami and my fellow cousin ape.
No comments:
Post a Comment