LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PHYSICS
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FIFTH SEMESTER – APRIL 2008
PH 5400 – GEO PHYSICS
Date : 03/05/2008 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
PART-A 10 X 2 = 20
Answer all questions
- What is meant by phases in seismic waves?
- What is a shadow zone?
- Give the significant differences between body wave and surface wave.
- Express Adams and Williamson equation for the variation of density with depth.
- Define the terms epicenter and focus of an earthquake.
- Write down the Laplace’s and Poisson’s equation obeyed by the gravitational potential.
- Explain briefly the Gauss method of determining the earth’s magnetic field.
- What are the prediction for the composition of the core from shock wave measurements?
- Give the decay schemes of the radio nuclide K40.
10 .List the two possible sources of heat within the earth.
PART-B 4 X 7.5 = 30
Answer any four questions
- What are P and S waves? Describe the method by which the epicenter of an earthquake is located.
- Outline the principle and construction of the strain seismograph.
- Give an account of the Richter Scale of magnitude for earthquakes.
- Describe the quantitative investigation for an equation of state of the mantle
- Discuss the variation of temperature within the earth.
PART-C 4 X 12.5 = 50
Answer any four questions
- Discuss the analogy between an optic wave and a seismic wave in terms of reflection
and refraction phenomenon.
- Obtain the Seismograph equation for a horizontal seismograph and deduce the two
types of instrumentation that follows the equation.
- Explain the working of i)Hammond and Faller method (of measuring gravity) and
ii)Worden gravitymeter with neat diagrams.(6+6.5)
- Explain the theory of i)saturation magnetometer and ii)Alkali vapour magnetometer(5+7.5)
- a) Discuss the flow of heat to the surface of the earth from the core.
- b) Discuss the source of heat within the earth.
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