The temperature perturbation at all the surface has penetrated to the

1.	The temperature perturbation at all the surface has penetrated to the depth
A.	1.6 ( T)<sup> 1/2</sup>
B.	2.6 ( T)<sup> 1/2</sup>
C.	3.6 ( T)<sup> 1/2</sup>
D.	4.6 ( T)<sup> </sup>
Answer» D. 4.6 ( T)<sup> </sup>

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