$(a)\;\large\frac{2}{5}\qquad(b)\;\large\frac{3}{5}\qquad(c)\;0.5\qquad(d)\;cant\;be\;determined$

Thermodynamics

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Answer : (b) $\;\large\frac{3}{5}$

Explanation :

Total heat $\; \bigtriangleup Q = \bigtriangleup C_{p} \bigtriangleup T$

Internal energy change $\; \bigtriangleup u = n C_{v} \bigtriangleup T$

Therefore , Fraction of energy going to increase internal energy ---

$\large\frac{\bigtriangleup u} { \bigtriangleup Q} = \large\frac{C_{v}}{ \bigtriangleup C_{p} } = \large\frac{1}{r} =\large\frac{3}{5}$

(Since helium is monoatomic )

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