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pair formation

n.
1.the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus

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    Idiom of the Day

    in jeopardy
    in danger, at risk
    Our contract with the large company was in jeopardy because of our inability to quickly provide them with our products.



    1.
    Joan heard the clock ________ midnight and realized that she had forgotten about their appointment.

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