Custom Physics Essays

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Physics Custom Essays: Atom Model Theory

The atomic theory is developed since 2000 years ago the Greek philosopher Democritus proposed that there was a limit to how small one could be divide matter, this smallest matter indivisible particle was called "atom". However this atomic theory of Democritus was criticized by Aristotle who proposed a model based on four basic "elements" of earth, air, fire and water. Aristotle's view held for the next 2000 years as it better suited religious beliefs of the time.

In 1801,an English teacher named John Dalton proposed his atomic theory which stated matter is composed of all small indivisible atoms, elements contain one type of atom; different elements contain different atoms, compounds contain more than one type of atom. In 1904, British physicist J.J Thomson and others demonstrated that cathode rays (electrons) were present in all matter.

Thomson proposed that the atom was a sphere of positive charge in which embedded were rings of negative charges (electrons) , like "plums in a pudding". Lather on, in 19 century, the discoveries of radiation leads to a new progress of Physics. We knew that certain elements emitting radiation, this suggested that atoms are no longer indivisible and not indestructible, as proposed in Dalton's atomic model.

Physics Custom Essays: Star Magnitude Distance

Spectroscopic Parallaxis the method of using the Hertzsprung - Russell (H-R) diagramand the distance modulus formulato determine the approximate distanceof the star. This technique can be applied to lots of stars, however the value determined for absolute magnitude from the H-R diagram can carry a large percentage error. Therefore you can use this method only to know the approximate distance not the exactly one.

This method involves several steps to find out the distance to the star. Using the photometryto measure the apparent magnitude (m) of the star. Photometryis the measurement of the brightness of a source of light or other radiation. Using spectroscopyto determine the spectral class and the luminosity class of the star. You can get expert help with your essays right now. Find out more... Using B and V filtersto determine the blue apparent magnitude (B).

Therefore we can determine the star's colour index from the equation which is CI = B - V. Using the H-R diagramto read off the absolute magnitude (M) from the vertical line's scale. Horizontal axis for the appropriate spectral class and if we know its luminosity class then we can constrain its position along this line more accurate.

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