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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
- Two particles of masses m₁ m₂ move with initial velocities u₁ and u₂
- The induced emf in a coil of 10 H inductance in which current varies
- Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- A spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
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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