# Translations:Appendix F: Exercises/5/en

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2. Let a shale bed be in the middle of a sandstone layer so that 12 m of sand lie above the shale and 12 m of sand lie below it. Let the thickness of the shale be such that the traveltime through it is the same as it would be through 12 m of sand. Let the reflection coefficient at the top of the shale be –0.1 and at the bottom of the shale be 0.1. For the wavelet given in exercise 1(a) above, find the composite reflected wavelet. This example shows that component reflections from several reflectors can interfere and give a tuned response. The ringing character results from the natural resonance.