Physics - 1 - 51 - Waves by Feynman

Author:Feynman
Language: fr
Format: mobi
Published: 2013-08-04T17:04:01+00:00

An example of the behavior pattern of waves in the earth is shown in Fig. 51-6.

The two kinds of waves are represented by different symbols. If there were an earth quake at the place marked "source," the transverse waves and longitudinal waves would arrive at different times at the station by the most direct routes, and there would also be reflections at discontinuities, resulting in other paths and times. It turns out that there is a core in the earth which does not carry transverse waves.

If the station is opposite the source, transverse waves still arrive, but the timing is not right. What happens is that the transverse wave comes to the core, and when ever the transverse waves come to a surface which is oblique, between two materials, two new waves are generated, one transverse and one longitudinal. But inside the core of the earth, a transverse wave is not propagated (or at least, there is no evidence for it, only for a longitudinal wave); it comes out again in both forms and comes to the station.

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