Thermal Properties of Matter - Result Question 30

31. A black body at 1227C emits radiations with maximum intensity at a wavelength of 5000\AA. If the temperature of the body is increased by 1000C, the maximum intensity will be observed at

(a) 5000\AA

(b) 6000\AA

(c) 3000\AA

(d) 4000\AA

[2006]

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Answer:

Correct Answer: 31. (c)

Solution:

  1. (c) Applying Wein’s displacement law,

λmT= constant 

5000\AA×(1227+273)=(2227+273)×λm

λm=5000×15001000=3000\AA



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