May 2011
Beginner
492 pages
14h 16m
English
The periodic flow of heat is very efficient in determining the conductivity of earth's crust. The earth's surface gets heated during the day and cooled during the night. This heating and cooling causes heat wave to travel inside the earth (diurnal wave). The earth also receives more heat during summer than in winter; this causes another heat wave to pass through earth's crust having a period of one year (annual wave). We assume the wave to be simple harmonic due to which the diurnal wave comes close by this, while the annual wave departs much. The matter is equivalent to an infinite wall periodically heated and cooled at one end or to a bar provided with a guard ring which is periodically heated and cooled. ...
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