Heat and Thermodynamics 3 Question 10

10. 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?

$(2005,2 M)$

(a) Sun- $T _1$, tungsten filament- $T _2$, welding arc- $T _3$

(b) Sun- $T _2$, tungsten filament $-T _1$, welding arc- $T _3$

(c) Sun- $T _3$, tungsten filament- $T _2$, welding arc- $T _1$

(d) Sun- $T _1$, tungsten filament- $T _3$, welding arc- $T _2$

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Solution:

  1. $\lambda _m T=$ constant

From the graph $T _3>T _2>T _1$

Temperature of Sun will be maximum.

Therefore, (c) is the correct option.

NOTE Although graphs are not very clear.



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