CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Introduction

The earth rec...

Question

The earth receives energy from the sun at the rate of $1400 {Wm}^{- 2} .$ The force exerted by the solar radiation on the roof of dimensions $(16 m \times 10 m)$ is nearly equal to $P \times 10^{- 4}$ . Find the value of $P$ -
$($ Assume absorption coefficient of roof is $0.8)$

A

9.00

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

9

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

9.0

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

Given,

$P = 1400 {Wm}^{- 2}; A = 160 m^{2}$

$α = 0.8 \Rightarrow r = 1 - α = 1 - 0.8 = 0.2$

For a partially absorbing surface, the force exerted by the radiation is,

$F = \frac{I A}{c} (1 + r)$

$F = \frac{1400 \times 160}{3 \times 10^{8}} \times (1 + 0.2)$

$F = 9 \times 10^{- 4} N$

Suggest Corrections

thumbs-up

0

Similar questions

Q. The intensity of solar radiation incident at the level of upper atmosphere of the earth is

1.35 {kW/m}^{2}

. What is the force exerted by this radiation on the solar panel of a satellite, of area

100 m^{2}

. Assume normal incidence and complete absorption.

Q. The earth receives solar energy at the rate of

2 c a l - c m^{- 2}

per minute. Assuming the radiation to be black body in character, estimate the surface temperature of the sun. Stefan's

c o n s t a n t = 5.67 \times 10^{- 8} W m^{- 2} K^{- 4}

and angular diameter of the sun

= 32

Q. The earth receives on its surface radiation from the sun at the rate of

1400 W m^{- 2}

. The distance of the centre of the sun from the surface of the earth is

1.5 \times 10^{11}

, and the radius of the sun is

7 \times 10^{8} m

. Treating the sun as a black body, it follows from the above data that its surface temperature is _______

K

Q. The earth receives solar radiation, at a rate of

8.2 {J cm}^{- 2} {min}^{- 1}

. Assuming that the sun radiates like a blackbody, calculate the surface temperature of the sun. The angle subtended by the sun on the earth is

{0.53}^{\circ}

and the Stefan's constant

σ = 5.67 \times 10^{- 8}

{Wm}^{- 2} K^{- 4}

The Sun delivers

10^{3} W / m^{2}

of electromagnetic flux to the Earth's surface. The radiation force on the roof of dimensions

8 m \times 20 m

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Introduction

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon