(B) Let $P$ be the power of the heater (heat supplied per unit time).For heating water from $0\,^oC$ to $100\,^oC$:$Q_1 = P \times t_1 = m \cdot c \cd

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(B) Let $P$ be the power of the heater (heat supplied per unit time).For heating water from $0\,^oC$ to $100\,^oC$:$Q_1 = P \times t_1 = m \cdot c \cdot \Delta T$$P \times 10 = m \times 1 \times (100 - 0) = 100m \quad ... (i)$For converting water at $100\,^oC$ to steam at $100\,^oC$:$Q_2 = P \times t_2 = m \cdot L$$P \times 55 = m \cdot L \quad ... (ii)$Dividing equation $(ii)$ by $(i)$:$\frac{P \times 55}{P \times 10} = \frac{m \cdot L}{100m}$$5.5 = \frac{L}{100}$$L = 5.5 \times 100 = 550\, cal/g$.

Class 11 Physics 10-1.Thermometry, Thermal Expansion and Calorimetry Latent Heat and Heating Curve

Medium

An experiment takes $10\, minutes$ to raise the temperature of water in a container from $0\,^oC$ to $100\,^oC$ and another $55\, minutes$ to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking the specific heat of water to be $1\, cal/g\,^oC$,the heat of vaporization according to this experiment will be ........ $cal/g$.

JEE MAIN 2015 All JEE MAIN

A
$560$
B
$550$
C
$540$
D
$530$

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10-1.Thermometry, Thermal Expansion and Calorimetry

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Latent Heat and Heating Curve

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The figure given below shows the cooling curve of a pure wax material after heating. It cools from $A$ to $B$ and solidifies along $BD$. If $L$ and $C$ are the respective values of latent heat and the specific heat of the liquid wax,the ratio $L/C$ is

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Explain the three states of matter and the process of change in states.

Medium

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$A$ solid substance is at $30^{\circ}C$. To this substance,heat energy is supplied at a constant rate. The temperature versus time graph is as shown in the figure. The substance is in the liquid state for the portion of the graph:

Easy

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Latent heat of ice is $80 \, cal/g$. $A$ man melts $60 \, g$ of ice by chewing in $1 \, minute$. His power is ........ $W$.

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$Assertion :$ Melting of a solid causes no change in internal energy.
$Reason :$ Latent heat is the heat required to melt a unit mass of a solid.

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The figure given below shows the cooling curve of a pure wax material after heating. It cools from $A$ to $B$ and solidifies along $BD$. If $L$ and $C$ are the respective values of latent heat and the specific heat of the liquid wax,the ratio $L/C$ is

Explain the three states of matter and the process of change in states.

$A$ solid substance is at $30^{\circ}C$. To this substance,heat energy is supplied at a constant rate. The temperature versus time graph is as shown in the figure. The substance is in the liquid state for the portion of the graph:

Latent heat of ice is $80 \, cal/g$. $A$ man melts $60 \, g$ of ice by chewing in $1 \, minute$. His power is ........ $W$.

$Assertion :$ Melting of a solid causes no change in internal energy.$Reason :$ Latent heat is the heat required to melt a unit mass of a solid.

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$Assertion :$ Melting of a solid causes no change in internal energy.
$Reason :$ Latent heat is the heat required to melt a unit mass of a solid.