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Which one of the following is graph for perfectly black body? is the frequency of radiation with maximum intensity, is the absolute temperature.
Intensity is directly proportional to energy.
Which one of the following is graph for perfectly black body? is the frequency of radiation with maximum intensity, is the absolute temperature.
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Three rods made of same material and having same crosssection are joined as shown in the figure. Each rod is of same length. The temperature at the junction of the three rods is
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Or
Or
Or
Or
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The figure shows a glass tube (linear coefficient of expansion is ) completely filled with a liquid of volume expansion coefficient On heating length of the liquid column does not change. Choose the correct relation between and
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In a vertical Utube containing a liquid, the two arms are maintained at different temperatures and The liquid columns in the two arms have heights and respectively. The coefficient of volume expansion of the liquid is equal to
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With temperature rise height of liquid in each arm increases
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With temperature rise height of liquid in each arm increases
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The metal X has a higher coefficient of expansion compared to that for metal Y so, on placing bimetallic strip in a cold bath, X will shrink more than . Hence, the strip will bend towards the left.
A bimetallic strip consists of metals and . It is mounted rigidly at the base as shown. The metal has a higher coefficient of expansion compared to that for metal . when bimetallic strip is placed in a cold bath
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The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and 2 and thickness and 4, respectively are and . The rate of heat transfer through the slab, in a steady state is , with equals to
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=
And =
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Hence, heat flow from composite slab is
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Accordingly, (iii)
By comparing Eqs. (ii) and (iii), we get
=
And =
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
= (ii)
Accordingly, (iii)
By comparing Eqs. (ii) and (iii), we get
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and 2 and thickness and 4, respectively are and . The rate of heat transfer through the slab, in a steady state is , with equals to
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Let the temperature of common interface be . Rate of heat flow
=
And =
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
= (ii)
Accordingly, (iii)
By comparing Eqs. (ii) and (iii), we get
=
And =
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
= (ii)
Accordingly, (iii)
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According to Wien’s displacement law . Hence, it temperature increases decreases peak of the curve shift towards left
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A metal rod of length has cross sectional areas and as shown in figure. The ends are maintained at temperatures and . The temperature at middle point is
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The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar show in figure, what will be the temperature at the junction of copper ad steel?
Let the temperature of junction be
3
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3
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The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar show in figure, what will be the temperature at the junction of copper ad steel?
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Let the temperature of junction be
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maths
Which function is shown in graph?
Which function is shown in graph?
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maths
Which function is shown in graph?
Which function is shown in graph?
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Which function is shown in graph?
Which function is shown in graph?
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Five rods of same dimensions are arranged as shown in figure. They have thermal conductivities When points are maintained at different temperature, no heat would flow through central rod, if
The equivalent electrical circuit, figure in these cases is of Wheatstone bridge. No current would flow through central rod when the bridge is balanced. The condition for balanced Wheatstone bridge is (in terms of resistances)
or
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or
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Five rods of same dimensions are arranged as shown in figure. They have thermal conductivities When points are maintained at different temperature, no heat would flow through central rod, if
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The equivalent electrical circuit, figure in these cases is of Wheatstone bridge. No current would flow through central rod when the bridge is balanced. The condition for balanced Wheatstone bridge is (in terms of resistances)
or
Or
or
Or