An Earthquake Generates Three Kinds of Waves: Surface Waves (L-Waves),which

question 133

Multiple Choice

An earthquake generates three kinds of waves: surface waves (L-waves) ,which are the slowest and weakest,shear (S) waves,which are transverse waves and carry most of the energy,and pressure (P) waves,which are longitudinal waves and are the fastest.The speed of P waves is approximately 7 km/s,and that of S waves is about 4 km/s.People do not generally feel the P waves,but animals seem to be sensitive to them.If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake?

• A)100 km
• B)200 km
• C)300 km
• D)400 km
• E)500 km

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Definitions:

Clinical Equipoise

The ethical principle in clinical research that requires genuine uncertainty within the expert medical community regarding the comparative therapeutic merits of each arm in a trial.

Treatment Options

Various medical interventions available for diagnosing, managing, or curing diseases or injuries.

Speciesism

The assumption of human superiority leading to the exploitation of animals, based on the belief that all and only human beings have intrinsic value.

Animal Experiments

The use of non-human animals in research to study biology, psychology, disease treatments, and medications, often with the aim of applying findings to human health.