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 . &nbsp Sun - T 3 , tungsten filament - T 1 , welding are - T 2 B . &nbsp Sun - T 2 , tungsten filament - T 1 , welding are - T 3 C . &nbsp Sun - T 3 , tungsten filament - T 2 , welding are - T 1 D . &nbsp Sun - T 1 , tungsten filament - T 2 , welding are - T 3

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

Discussion Forum : Heat Transfer

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 -

T_{3}

, tungsten filament -

T_{1}

, welding are -

T_{2}

B . Sun -

T_{2}

, tungsten filament -

T_{1}

, welding are -

T_{3}

C . Sun -

T_{3}

, tungsten filament -

T_{2}

, welding are -

T_{1}

D . Sun -

T_{1}

, tungsten filament -

T_{2}

, welding are -

T_{3}

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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