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Q.

The graphs shown in the figure represent energy density Eλversus λ for three A sources sun, welding arc and tungsten filament. For λmax, correct combination will be :

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a

1-tungsten, 2-welding arc, 3-sun

b

1-sun, 2-tungsten, 3-welding arc

c

1-sun, 2-welding arc, 3-tungsten

d

1-welding arc, 2-sun, 3-tungsten

answer is A.

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Detailed Solution

As λ1>λ2>λ3 so T3>T2>T1 λT= CONSTANT  acc to wein's displacement law.
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The graphs shown in the figure represent energy density Eλversus λ for three A sources sun, welding arc and tungsten filament. For λmax, correct combination will be :