An ideal mono atomic gas A is supplied heat so as to expand without changing its temperature. In another process, starting with the same state, it is supplied heat at constant pressure. In both the cases a graph of work done by the gas (W) is plotted versus heat added (Q) to the gas. The ratio of slope of the graphs obtained in first and second process is `eta_(1)`. The same ratio obtained for an ideal diatomic gas in `eta_(2)`. Find the ratio `(eta_(1))/(eta_(2))`.