At the penetration depth d, there will be 1% perturbation at a time gi

1.	At the penetration depth d, there will be 1% perturbation at a time given by
A.	4 d <sup>2</sup>/13
B.	3 d <sup>2</sup>/13
C.	2 d <sup>2</sup>/13
D.	d <sup>2</sup>/13
Answer» E.

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