A heavy nucleus Q of half-life 20 minutes undergoes alpha-decay with probability of 60% and beta-decay with probability of 40%. Initially, the number of Q nuclei is 1000. The number of alpha-decays of Q in the first one hour is

(A) 50        (B) 75        (C) 350        (D) 525 Continue reading A heavy nucleus Q of half-life 20 minutes … →