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  1. The depth of penetration at 4 MHz is 10 cm, then at 2.5 MHz it is

    2. A.
    62.5 cm
    B.
    13 cm
    C.
    6.25 cm
    D.
    8 cm

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    Answer : Option B

    Explanation :

    Depth of penetration

    δ2 = 12.64 cm.

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