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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.
Related Questions: - The original temperature of a black body is 727⁰C. The temperature at which this black
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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
- The original temperature of a black body is 727⁰C. The temperature at which this black
- A glass slab consists of thin uniform layers of progressively decreasing refractive
- A car moves from X to Y with a uniform speed v(u) and returns to Y with a uniform speed
- A radiactive substance emits 100 beta particles in the first 2s and 50 beta
- A cockroach is moving with a velocity v in anticlockwise direction on the rim
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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