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)

A

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

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B

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

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C

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

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D

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

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Solution

## The correct option is B Sun - T3, tungsten filament - T1, welding are - T2 According to Wein's displacement law λm×T = Constant Here λm<λm2<λm1 ⇒T3>T2>T1 The temperature of Sun is higher than that of welding arc which in turn is greater than tungsten filament. Therefore T3 is the Sun's temperature, T2 the welding arc's and T1 the tungsten filament's.

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