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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: - Light emitted during the de excitation of electron from n=3 to n=2, when incident
- An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
- Zener diode is used
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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
- Light emitted during the de excitation of electron from n=3 to n=2, when incident
- An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
- Zener diode is used
- A rod of weight W is supported by two parallel knife edges A and B is in equilibrium
- A thermocouple is made from two metals, antimony and bismuth. If one junction
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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