(B) The absorption power (or absorptivity) of a body is defined as the ratio of the amount of heat absorbed by the body to the total amount of heat in

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(B) The absorption power (or absorptivity) of a body is defined as the ratio of the amount of heat absorbed by the body to the total amount of heat incident on it.Given:Total heat incident on the body = $p$ calories.Heat absorbed by the body = $q$ calories.Therefore,Absorption power = $\frac{\text{Heat absorbed}}{\text{Total heat incident}} = \frac{q}{p}$.Thus,the correct option is $B$.

Class 11 Physics 2 Thermal Properties of Matter: Heat Transfer Radiation (General, Kirchoff's law, Black body, Prevost's Theory)

Easy

When $p$ calories of heat is given to a body,it absorbs $q$ calories; then the absorption power of the body will be

A
$p/q$
B
$q/p$
C
$p^2/q^2$
D
$q^2/p^2$

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Class 11 Questions

Class 11

Physics Questions

Chapter

2 Thermal Properties of Matter: Heat Transfer

Subtopic

Radiation (General, Kirchoff's law, Black body, Prevost's Theory)

$A$ total radiation of $400 \ J$ is incident on a body. If $20\%$ of the radiation is reflected and $120 \ J$ is absorbed,find the percentage of the transmittive power.

Easy

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Write a short note on the Greenhouse Effect.

Easy

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An ideal black body at room temperature is thrown into a furnace. It is observed that:

MediumIIT 2002

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The surface of a thermos flask is kept shiny because:

Medium

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$A$ sphere,a cube,and a thin circular plate,all made of the same material and having the same mass,are initially heated to a temperature of $1000^{\circ}C$. Which one of these will cool first?

MediumIIT 1972

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When $p$ calories of heat is given to a body,it absorbs $q$ calories; then the absorption power of the body will be

Similar Questions

$A$ total radiation of $400 \ J$ is incident on a body. If $20\%$ of the radiation is reflected and $120 \ J$ is absorbed,find the percentage of the transmittive power.

Write a short note on the Greenhouse Effect.

An ideal black body at room temperature is thrown into a furnace. It is observed that:

The surface of a thermos flask is kept shiny because:

$A$ sphere,a cube,and a thin circular plate,all made of the same material and having the same mass,are initially heated to a temperature of $1000^{\circ}C$. Which one of these will cool first?

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