(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)

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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?

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)

When we enter an air-conditioned room,we feel cold. This can be explained by:

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$A$ certain substance emits only the wavelengths ${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$ when it is at a high temperature. When this substance is at a colder temperature,it will absorb only the following wavelengths:

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$Assertion$ : The Earth without an atmosphere would be inhospitably cold.
$Reason$ : All heat would escape in the absence of an atmosphere.

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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 heated to the same temperature of $200^{\circ} C$. When these are left in a room,which one reaches room temperature the fastest?

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Which of the following is an example of an ideal black body?

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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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When we enter an air-conditioned room,we feel cold. This can be explained by:

$A$ certain substance emits only the wavelengths ${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$ when it is at a high temperature. When this substance is at a colder temperature,it will absorb only the following wavelengths:

$Assertion$ : The Earth without an atmosphere would be inhospitably cold.$Reason$ : All heat would escape in the absence of an atmosphere.

$A$ sphere,a cube,and a thin circular plate,all made of the same material and having the same mass,are heated to the same temperature of $200^{\circ} C$. When these are left in a room,which one reaches room temperature the fastest?

Which of the following is an example of an ideal black body?

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$Assertion$ : The Earth without an atmosphere would be inhospitably cold.
$Reason$ : All heat would escape in the absence of an atmosphere.