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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 cylindrical tank is filled with water to a level of 3m. A hole is opened at a height
- A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
- A step down transformer is used on a 1000 V line to deliver 20 A at 120 V
- Photoelectric current from a given photocell will depend upon
- The most important characteristic of electron in the production of X-rays 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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