For an element decaying through simultan...

For an element decaying through simultaneous reaction,the half life for respective decaying path is 1400 s and 700 s. Find the time taken when the number of atoms `N_0/3` in the element sample. (`N_0` is initial number of atoms in sample)

`1400/5 ln 3`

`1400/3 ln 3`

`1400/3 ln 2`

`700/3 ln 2`

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