Two substances A and B of equal mass m are he | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The rate of heat supply is constant for both substances,given as $P = 6 \, cal \, s^{-1}$.For a substance,the heat absorbed during the phase chang

Vedclass · Accepted Answer

$8/5$

Vedclass · Answer

(C) The rate of heat supply is constant for both substances,given as $P = 6 \, cal \, s^{-1}$.For a substance,the heat absorbed during the phase change (fusion) is given by $H = P 	imes \Delta t$,where $\Delta t$ is the time interval during which the temperature remains constant (the horizontal part of the graph).For substance $A$,the temperature remains constant from $t = 2 \, s$ to $t = 6 \, s$. Thus,the time interval for fusion is $\Delta t_A = 6 - 2 = 4 \, s$.The heat absorbed by $A$ is $H_A = P 	imes \Delta t_A = 6 	imes 4 = 24 \, cal$.For substance $B$,the temperature remains constant from $t = 4 \, s$ to $t = 6.5 \, s$ (as seen from the graph,the horizontal section ends between $6$ and $7$,specifically at $6.5$). Thus,the time interval for fusion is $\Delta t_B = 6.5 - 4 = 2.5 \, s$.The heat absorbed by $B$ is $H_B = P 	imes \Delta t_B = 6 	imes 2.5 = 15 \, cal$.The ratio of heat absorbed is $\frac{H_A}{H_B} = \frac{P 	imes \Delta t_A}{P 	imes \Delta t_B} = \frac{4}{2.5} = \frac{40}{25} = \frac{8}{5}$.

Column-$I$	Column-$II$
$A$. Conversion of liquid into solid is	$1$. Regelation
$B$. Conversion of liquid into vapour is	$2$. Sublimation
$C$. Conversion of solid into vapour directly is	$3$. Fusion
$D$. Melting of ice caused by pressure is	$4$. Vaporisation

Two substances $A$ and $B$ of equal mass $m$ are heated at a uniform rate of $6 \, cal \, s^{-1}$ under similar conditions. $A$ graph between temperature and time is shown in the figure. The ratio of heat absorbed $H_A/H_B$ by them for complete fusion is

Similar Questions

Boiling water is changing into steam. Under this condition,the specific heat of water is

Compared to a burn due to water at $100^{\circ}C$,a burn due to steam at $100^{\circ}C$ is

$A$ solid material is supplied with heat at a constant rate. The temperature of the material changes with heat input as shown in the figure. What does the slope of $DE$ represent?

What are fusion and melting point? On what does the value of melting point depend?

Vedclass Test Series

Exam Paper Generator

Online Exam Module