(C) Perspiration involves the exchange of heat from the body to the surroundings. Water absorbs latent heat from the body to undergo phase change from

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If the Assertion is correct but Reason is incorrect.

(C) Perspiration involves the exchange of heat from the body to the surroundings. Water absorbs latent heat from the body to undergo phase change from liquid to vapour. This process removes thermal energy from the skin,causing the body to cool down. Emissivity is a property of the surface material. $A$ thin layer of water on the skin does not enhance its emissivity; in fact,it does not significantly change the emissivity of the skin in the context of cooling. Therefore,the Assertion is correct,but the Reason is incorrect.

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

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$Assertion :$ Perspiration from the human body helps in cooling the body.
$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

AIIMS 2006 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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10-1.Thermometry, Thermal Expansion and Calorimetry

Subtopic

Latent Heat and Heating Curve

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Match the following according to conversion by heat:

Column-$I$ Column-$II$

$(a)$ Required heat to convert solid into gaseous. $(i)$ Latent heat of fusion

$(b)$ Required heat to convert solid into liquid. $(ii)$ Latent heat of vaporization

Column-$I$	Column-$II$
$(a)$ Required heat to convert solid into gaseous.	$(i)$ Latent heat of fusion
$(b)$ Required heat to convert solid into liquid.	$(ii)$ Latent heat of vaporization

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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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What is vaporization? What is normal boiling point?

Medium

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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

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$Assertion :$ Perspiration from the human body helps in cooling the body.$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

Similar Questions

Match the following according to conversion by heat: Column-$I$ Column-$II$ $(a)$ Required heat to convert solid into gaseous. $(i)$ Latent heat of fusion $(b)$ Required heat to convert solid into liquid. $(ii)$ Latent heat of vaporization

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

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

What is vaporization? What is normal boiling point?

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

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$Assertion :$ Perspiration from the human body helps in cooling the body.
$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

Match the following according to conversion by heat:

Column-$I$ Column-$II$

$(a)$ Required heat to convert solid into gaseous. $(i)$ Latent heat of fusion

$(b)$ Required heat to convert solid into liquid. $(ii)$ Latent heat of vaporization