Mastering physics 36.6?

Posted on 2016-03-18 18:52:00 in Physics by DANGEL

On Dec. 26, 2004, a violent magnitude 9.0 earthquake occurred off the coast of Sumatra. This quake triggered a huge tsunami (similar to a tidal wave) that killed over 150,000 people. Scientists observing the wave on the open ocean measured the time between crests to be 1.0 h and the speed of the wave to be 800 km/h. Computer models of the evolution of this enormous wave showed that it bent around the continents and spread to all the oceans of the earth. When the wave reached the gaps between continents, it diffracted between them as through a slit. 

Part A - What was the wavelength of this tsunami? (in km) 

Part B - The distance between the southern tip of Africa and northern Antarctica is about 4500 km. As an approximation, we can model this wave's behavior by using Fraunhofer diffraction. Find the smallest angle away from the central maximum for which the waves would cancel after going through Africa and Antarctica gap. (in degrees)

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