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A piece of iron is heated in a flame. It first comes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using
Options
(a) Wien’s displacement law
(b) Kirchoff’s law
(c) Newton’s law of cooling
(d) Stefan’s law
Correct Answer:
Wien’s displacement law
Explanation:
Wien’s displacement law, According to this law,
λmax ∞ 1 / T or λmax x T = constant. So, as the temperature increases λ decreases.
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Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically.
- Imagine a light planet revolving around a very massive star in a circular
- A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens
- Two electrons are separated by a distance of 1Å. What is the coulomb force between them?
- A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m
Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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