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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: - Three fourth of the active material decays in a radioactive sample in 3/4 sec
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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
- Three fourth of the active material decays in a radioactive sample in 3/4 sec
- If the error in the measurement of momentum of particle is (+100%)
- For photoelectric emission from certain metal the cut-off frequency is v
- Moderator used in nuclear reactor is
- Two concentric coils each of radius equal to 2π cm are placed at right angles
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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