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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
- If the kinetic energy of the particle is increased to 16 times its previous value
- A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm
- Two capacitors of capacitances 2 μF and 3 μF are joined in series.
- Electric field intensity at a point in between two parallel sheets due to like
- If the dimensions of a physical quantity are givenby Mᵃ Lᵇ Tᶜ, then the physical
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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