Discussion
Ground penetrating radar penetrating 1.5 m in wet clay but 15 m in dry sand differs by a factor of
Answer: C
Correct answer: 10
\[ \frac{15}{1.5} = 10. \] The factor of ten between wet clay and dry sand shows how completely the ground governs radar performance. It is why the method is excellent for locating services beneath a dry made-up road and nearly useless on a saturated clay site.
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