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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 charge Q is enclosed by a Gaussian spherical surface of radius R
- Two identical cells of the same e.m.f. and same internal resistance
- Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
- Which of the following is an example of ideal black body?
- The number of photons of wavelength of 540 nm emitted per second by an electric bulb
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A charge Q is enclosed by a Gaussian spherical surface of radius R
- Two identical cells of the same e.m.f. and same internal resistance
- Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
- Which of the following is an example of ideal black body?
- The number of photons of wavelength of 540 nm emitted per second by an electric bulb
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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