Two radioactive sources \( A \) and \( B \) initially contain equal number of radioactive atoms....

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Two radioactive sources \( A \) and \( B \) initially contain equal number of radioactive atoms. Source \( A \) has a half-life of 1 hour and source B has a half-life of 2 hours. At the end of 2 hours, the ratio of the rate of disintegration of \( A \) to that of \( B \) is :
(A) \( 1: 2 \)
(B) \( 2: 1 \)
(C) \( 1: 1 \)
(D) \( 1: 4 \)
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