Two substances A and B of equal mass m are heated at uniform rate of 6 cal/s ? 1 under similar conditions. A graph between temperature and time is shown in figure. ratio of heat absorbed $H_{A} / H_{B}$ by them for complete fusion is

\frac{1}{2}

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\frac{1}{3}

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\frac{8}{5}

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\frac{1}{4}

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Solution

The correct option is C $\frac{8}{5}$
$\begin{matrix} f r o m g i v e n c u r v e, m e l t i n g p o i n t A = 60^{0} C a n d m e l t i n g p o i n t B = 20^{0} C t i m e t a k e n b y A f o r f u s i o n = (6 - 2) = 4 min t i m e t a k e n b y B f o r f u s i o n = (6.5 - 4) = 2.5 min t h e n, \frac{H_{A}}{H_{B}} = \frac{6 \times 4 \times 60}{6 \times 2.5 \times 60} = \frac{8}{5} \end{matrix}$
Hence,
option $(C)$ is correct answer.

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Two substances A and B of equal mass m are heated at uniform rate of 6 cal/s ? 1 under similar conditions. A graph between temperature and time is shown in figure. ratio of heat absorbed HA/HB by them for complete fusion is

The correct option is C 85fromgivencurve,meltingpointA=600CandmeltingpointB=200CtimetakenbyAforfusion=(6−2)=4mintimetakenbyBforfusion=(6.5−4)=2.5minthen,HAHB=6×4×606×2.5×60=85Hence,option (C) is correct answer.

Two substances A and B of equal mass m are heated at uniform rate of 6 cal/s ? 1 under similar conditions. A graph between temperature and time is shown in figure. ratio of heat absorbed $H_{A} / H_{B}$ by them for complete fusion is