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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 car of mass m starts from rest and accelerates so that the instantaneous
- A beam of light of wavelength 600 nm from a distant source falls
- For the normal eye, the cornea of eye provides a converging power of 40D
- Identify the wrong statement
- If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A car of mass m starts from rest and accelerates so that the instantaneous
- A beam of light of wavelength 600 nm from a distant source falls
- For the normal eye, the cornea of eye provides a converging power of 40D
- Identify the wrong statement
- If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system
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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