Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match? (IIT JEE 2005) Options: A . &nbspSun - T3, tungsten filament - T1, welding are - T2 B . &nbspSun - T2, tungsten filament - T1, welding are - T3 C . &nbspSun - T3, tungsten filament - T2, welding are - T1 D . &nbspSun - T1, tungsten filament - T2, welding are - T3

Variation of radiant energy emitted by sun, filament of tungsten lamp and weldin

Question

Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match? (IIT JEE 2005)

Options:

A . Sun - T3, tungsten filament - T1, welding are - T2

B . Sun - T2, tungsten filament - T1, welding are - T3

C . Sun - T3, tungsten filament - T2, welding are - T1

D . Sun - T1, tungsten filament - T2, welding are - T3

Answer: Option A
:
A
According to Wein's displacement law

λ m \times T

= Constant
Here

λ m < λ m 2 < λ m 1

\Rightarrow T_{3} > T_{2} > T_{1}

The temperature of Sun is higher than that of welding arc which in turn is greater than tungsten filament.
Therefore

T_{3}

is the Sun's temperature,

T_{2}

the welding arc's and

T_{1}

the tungsten filament's.

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