JEE Advanced Physics 2021 Shift 1 #4 Nuclear Decay

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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-decay in the first one hour is:
A) 50
B) 75
C) 350
D) 525

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[vikrantsingh]

Great, the pictorial representation helps me a lot !! Thnaks

[jeffreyluciana]

Excellent. You made this problem very simple

[michaelempeigne]

However, if you made an equation instead, it would be : 500*0.6*[ 1 + ( 1 / 2) + ( 1 / 2 )^2 ]

[footballmadness]

sir I just started following your channel, Amazing content!!

[vavavoom]

it was medium difficult question but other this type of question was difficult