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Class 11
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Physics
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Thermal Properties of Matter
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Radiation
Radiation
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What is Radiation?
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Stefan Boltzmann Law
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Special Distribution of Blackbody Radiation - Wien's Law
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Radiation - I
18 mins
Radiation - II
7 mins
Clothes We Wear in Different Seasons
8 mins
Introduction to Stefan Boltzmann law
7 mins
Wien's Displacement Law
18 mins
Quick Summary With Stories
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Important Questions
A body cools from
8
0
∘
C to
5
0
∘
C in
5
minutes. Calculate the time it takes to cool from
6
0
∘
C to
3
0
∘
C. The temperature of the surroundings is
2
0
∘
C.
Medium
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>
A spherical black body with a radius of 12cm radiates 450W power at 500K. If the radius were halved and the temperature doubled, the power radiated in watts would be :
Medium
View solution
>
The temperature of equal masses of three different liquids
A
,
B
and
C
are
1
2
∘
C
,
1
9
∘
C
and
2
8
∘
C
respectively. The temperature when
A
and
B
are mixed is
1
6
∘
C
and when
B
and
C
are mixed it is
2
3
∘
C
. What should be the temperature when
A
and
C
are mixed?
Hard
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>
A black body at a temperature of
2
2
7
∘
C
radiates heat energy at the rate
5
c
a
l
/
c
m
2
/
s
. At a temperature of
7
2
7
∘
C
, the rate of heat radiated per unit area in
c
a
l
/
c
m
2
will be:
Medium
View solution
>
A pan filled with hot food cools from
9
4
∘
C
to
8
6
∘
C
in
2
minutes. When the room temperature is
2
0
∘
C
. How long will it cool from
7
4
∘
C
to
6
6
∘
C
?
Medium
View solution
>
A body cools down from
8
0
o
C
to
6
0
o
C
in
1
0
Minutes when the temperature of surrounding is
3
0
o
C
. The temperature of the body after next
1
0
minutes will be:
Medium
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>
State Kirchhoff's law of radiation and prove it theoretically.
Medium
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>
State:
Wien's displacement law
Easy
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>
Certain quantity of water cools from
7
0
o
C
to
6
0
o
C
in the first
5
minutes and to
5
4
o
C
in the next
5
minutes. The temperature of the surroundings is ;
Medium
NEET
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>
A sphere , a cube and a thin circular plate,all of same materials and same mass, are initially heated to same high temperature.
Medium
View solution
>