The nuclei of two radioactive isotopes of same substance A 236 and A 234 are present in the ratio
4 : 1 in an ore obtained from Mars. Their half lives are 30 min and 60 min respectively. Both isotopes are alpha emitters and the activity of the isotope with half life 30 min is one Rutherford. Calculate after how much time (in min) their activities will become identical.
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Nuclei 
Half life 30 : 60
Activity 
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