Question

$50\, gm$ ice at $0^{\circ} C$ in insulator vessel, $50\, g$ water of $100^{\circ} C$ is mixed in it, then final temperature of the mixture is (neglect the heat loss):

• A. $ 10^{\circ} C $
• B. $ 0^{\circ} < < T_{m} < 20^{\circ} C$
• C. $ 20^{\circ} C $
• D. Above $ 20^{\circ} C $

Answer 1

Answer: (A)

According to galvanometer principle,
heat given =heat taken
$m_{1} s_{1}(100-t) =m L +m_{2} s_{2}(t-0)$
$50 \times 1(100-t) =50 \times 80+50 \times 1(t-0)$
$t =10^{\circ} C$