(C) The intensity of radiation on a surface is given by the formula $I_{\theta} = I_0 \cos \theta$,where $I_0$ is the intensity when the surface is no

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(C) The intensity of radiation on a surface is given by the formula $I_{\theta} = I_0 \cos \theta$,where $I_0$ is the intensity when the surface is normal to the rays and $\theta$ is the angle between the normal to the surface and the direction of the rays.Given $\theta = 60^{\circ}$,we have:$I_{\theta} = I_0 \cos 60^{\circ}$Since $\cos 60^{\circ} = \frac{1}{2}$,we get:$I_{\theta} = I_0 \times \frac{1}{2} = \frac{I_0}{2}$.

Class 11 Physics 10-2.Heat Transfer Radiation (General, Kirchoff's law, Black body, Prevost's Theory)

Easy

The intensity of direct sunlight on a surface normal to the rays is $I_0$. What is the intensity of direct sunlight on a surface,whose normal makes an angle of $60^{\circ}$ with the rays of the sun?

A
$I_0$
B
$I_0 \left( \frac{\sqrt{3}}{2} \right)$
C
$\frac{I_0}{2}$
D
$2I_0$

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10-2.Heat Transfer

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

Heat energy is incident on the surface of a material at the rate of $1000 \ J \ min^{-1}$. If the coefficient of absorption is $0.8$ and the coefficient of reflection is $0.1$,then the amount of heat energy transmitted through the material in $5$ minutes is: (in $J$)

MediumMHT CET 2018

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Which of the following statements is true for a perfectly black body?

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Why are the bottom layers of cooking vessels kept black in color?

Medium

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The following graph shows the correct variation in the intensity of heat radiations emitted by a black body with respect to frequency at different fixed temperatures. Identify the correct graph.

Medium

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If $150 \,J$ of energy is incident on an area of $2 \,m^{2}$. If $Q_{r}=15 \,J$ and the coefficient of absorption is $0.6$,then the amount of energy transmitted is: (in $\,J$)

DifficultMHT CET 2009

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The intensity of direct sunlight on a surface normal to the rays is $I_0$. What is the intensity of direct sunlight on a surface,whose normal makes an angle of $60^{\circ}$ with the rays of the sun?

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Heat energy is incident on the surface of a material at the rate of $1000 \ J \ min^{-1}$. If the coefficient of absorption is $0.8$ and the coefficient of reflection is $0.1$,then the amount of heat energy transmitted through the material in $5$ minutes is: (in $J$)

Which of the following statements is true for a perfectly black body?

Why are the bottom layers of cooking vessels kept black in color?

The following graph shows the correct variation in the intensity of heat radiations emitted by a black body with respect to frequency at different fixed temperatures. Identify the correct graph.

If $150 \,J$ of energy is incident on an area of $2 \,m^{2}$. If $Q_{r}=15 \,J$ and the coefficient of absorption is $0.6$,then the amount of energy transmitted is: (in $\,J$)

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