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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
- Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life
- A proton beam enters a magnetic field of 10⁻⁴ Wb/m² normally. If the specific charge
- The original temperature of a black body is 727⁰C. The temperature at which this black
- Parsec is the unit of
- If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius
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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