(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)

There is a black spot on a body. If the body is heated and carried into a dark room,then it glows more than the rest of the body. This can be explained on the basis of:

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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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When a body has the same temperature as that of its surroundings,which of the following statements is true?

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We consider the radiation emitted by the human body,which of the following statements is true?

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The graph shows the blackbody radiation curves at temperatures $T_1$ and $T_2$. Which of the following is correct? $(T_2 > T_1)$

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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?

Similar Questions

There is a black spot on a body. If the body is heated and carried into a dark room,then it glows more than the rest of the body. This can be explained on the basis of:

$A$ 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:

When a body has the same temperature as that of its surroundings,which of the following statements is true?

We consider the radiation emitted by the human body,which of the following statements is true?

The graph shows the blackbody radiation curves at temperatures $T_1$ and $T_2$. Which of the following is correct? $(T_2 > T_1)$

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