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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
- Electrical force is acting between two charges kept in vacuum. A copper plate
- An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
- Consider two nuclei of the same radioactive nuclide. One of the nuclei was created
- A capacitor of 10 µF charged upto 250 volt is connected in parallel with another
- The inductive reactance of an inductor of 1/π henry at 50 Hz frequency is
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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