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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: - Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept
- The unit of electric permittivity is
- If the ionisation energy for the hydrogen atom is 13.6 eV, the energy required
- The kinetic energy of particle moving along a circle of radius R depends
- Magnetism of a magnet is due to
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept
- The unit of electric permittivity is
- If the ionisation energy for the hydrogen atom is 13.6 eV, the energy required
- The kinetic energy of particle moving along a circle of radius R depends
- Magnetism of a magnet is due to
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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