(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 2 Thermal Properties of Matter: 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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Class 11

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Chapter

2 Thermal Properties of Matter: Heat Transfer

Subtopic

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

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When red glass is heated in a dark room,it will appear:

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If $E$ is the total energy emitted by a body at temperature $T \ K$ and $E_{max}$ is the maximum energy emitted by it at the same temperature,then:

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The rate of emission of a body doubles when its temperature is increased by $10^{\circ}C$. If the temperature of the body is increased from $10^{\circ}C$ to $100^{\circ}C$,the rate of emission increases by a factor of:

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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:

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

When red glass is heated in a dark room,it will appear:

If $E$ is the total energy emitted by a body at temperature $T \ K$ and $E_{max}$ is the maximum energy emitted by it at the same temperature,then:

The rate of emission of a body doubles when its temperature is increased by $10^{\circ}C$. If the temperature of the body is increased from $10^{\circ}C$ to $100^{\circ}C$,the rate of emission increases by a factor of:

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