ThomasTsoi.com » Physics http://www.thomastsoi.com My World, My Rules. Fri, 29 Apr 2011 09:46:18 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Planetary Motion http://www.thomastsoi.com/2010/03/planetary-motion/ http://www.thomastsoi.com/2010/03/planetary-motion/#comments Mon, 22 Mar 2010 03:46:14 +0000 Thomas Tsoi http://www.thomastsoi.com/?p=159 Introduction

We shall then try to solve and investigate the motion of the planet by using a spreadsheet.

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]]> http://www.thomastsoi.com/2010/03/planetary-motion/feed/ 0 Muon Lifetime Measurement http://www.thomastsoi.com/2010/03/muon-lifetime-measurement/ http://www.thomastsoi.com/2010/03/muon-lifetime-measurement/#comments Mon, 22 Mar 2010 03:31:15 +0000 Thomas Tsoi http://www.thomastsoi.com/?p=151 Introduction

Muons were first discovered by Carl Anderson, Seth Neddermeyer and their colleagues in 1936, when they studied the tracks left behind by comic rays in their cloud chamber. Atmospheric muons are short-lived particles but are nonetheless fast-moving and thus have high penetrating power. They can pass through a block of lead easily without being stopped.

In order to measure the half-life of muons, Coan, Liu and Ye described a method using a time-to-digital converter to record the lifetime of individual muons detected. Mühry and Ritter suggested a simpler method using a digital oscilloscope.

The present experiment was interested in verifying the high penetrating power of muons, and based on the above-mentioned methods, measuring the half-life of muons using two different approaches.

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]]> http://www.thomastsoi.com/2010/03/muon-lifetime-measurement/feed/ 0 Expansion of the Universe http://www.thomastsoi.com/2010/03/expansion-of-the-universe/ http://www.thomastsoi.com/2010/03/expansion-of-the-universe/#comments Mon, 22 Mar 2010 03:20:19 +0000 Thomas Tsoi http://www.thomastsoi.com/?p=144 Introduction
Denoting the size of the universe at time universe is described by Einstein’s equation of motion. The first term of the equation describes the gravitational attraction and the second term describes the vacuum repulsion. Our task is to describe the future expansion of the universe and trace backward to find the age of it under different values of ΩM and ΩL.

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