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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 wire of resistance 4 ohm is stretched to twice its original length.
- Young’s modulus of the material of a wire is 18×10¹¹ dyne cm⁻².its value in SI is
- Heat is not being exchanged in a body. If its internal energy is increased, then
- Two balls are dropped from heights h and 2h respectively. The ratio of times
- The most stable particle in Baryon group is
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A wire of resistance 4 ohm is stretched to twice its original length.
- Young’s modulus of the material of a wire is 18×10¹¹ dyne cm⁻².its value in SI is
- Heat is not being exchanged in a body. If its internal energy is increased, then
- Two balls are dropped from heights h and 2h respectively. The ratio of times
- The most stable particle in Baryon group is
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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