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    Question

    Given below are wo statements, one is labelled as

    Assertion A and the other is labelled as Reason R Assertion A: The probe of a neutron moisture meter is inserted into an access tube fixed vertically in the soil Reason R: The probe of a neutron moisture meter contains a source of fast protons and a detector fo slow electrons and helps in estimating soil moisture content In light of the above statements, choose the most appropriate answer from the options given below
    A Both A and R are correct and R is the correct explanation of A Correct Answer Incorrect Answer
    B Both A and R are correct but R is NOT the correct explanation of A Correct Answer Incorrect Answer
    C A is correct but R is not correct Correct Answer Incorrect Answer
    D A is not correct but R is correct Correct Answer Incorrect Answer

    Solution

    The probe typically contains a source of neutrons (not fast protons) and a detector to measure the scattering or absorption of these neutrons by the soil. The measurement of neutron radiation helps in estimating the soil moisture content. 

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