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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: - A bar magnet with magnetic moment 2.5×10³ JT⁻¹ is rotating in horizontal plane
- A radiotransmitter radiates 1 kW power at a wavelength 198.6 m. How many photons
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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 bar magnet with magnetic moment 2.5×10³ JT⁻¹ is rotating in horizontal plane
- A radiotransmitter radiates 1 kW power at a wavelength 198.6 m. How many photons
- A simple pendulum has a time period T₁ when on the earth’s surface and T₂ When taken
- When a mass M is attached to the spring of force constant k,
- A spring when stretched by 2mm containing energy 4 J. If it is stretched
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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