Write your question here... Two radioactive elements P and Q have half lives 10 and 20 minutes respectively. If they started if with the same number of atoms, what is the ratio of the number of remaining atoms of P to that of Q?

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Answer 1 · 2018-02-18T20:42:19

Half life of an element is defined as the time take by it to decompose to half of its initial value.

#P->P/2=>10min#
#P/2->P/4=>10min#

net ;- #P->P/4=>20min#

#color(white)t#

#Q->Q/2=>20min#

ratio of the number of remaining atoms of P to that of Q (after 20mins, i considered it, since it wasnt mentioned int he question)

#=> P/4:Q/2#

#=>P/2:Q#

#=>P:2Q#