Three stars $$A,$$ $$B,$$ and $$C$$ have surface temperatures $$T_A,~T_B$$and $$T_C$$ respectively. Star $$A$$ appears bluish, star $$B$$ appears reddish and star $$C$$ yellowish. Hence,

1. $$T_A>T_B>T_C$$
2. $$T_B>T_C>T_A$$
3. $$T_C>T_B>T_A$$
4. $$T_A>T_C>T_B$$
Subtopic:  Wien's Displacement Law |
68%
From NCERT
NEET - 2020
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The power radiated by a black body is $$P$$ and it radiates maximum energy at wavelength ${}_{}$$$\lambda_0$$. Temperature of the black body is now changed so that it radiates maximum energy at the wavelength $$\frac{3}{4}\lambda_0$$. The power radiated by it now becomes $$nP$$. The value of $$n$$ is:
1. $$\frac{3}{4}$$
2. $$\frac{4}{3}$$
3. $$\frac{256}{81}$$
4. $$\frac{81}{256}$$

Subtopic:  Wien's Displacement Law |
65%
From NCERT
NEET - 2018
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A black body is at a temperature of $$5760~\mathrm{K}$$. The energy of radiation emitted by the body at wavelength $$250~\mathrm{nm}$$ is $$U_1$$, at wavelength $$500~\mathrm{nm}$$ is $$U_2$$ and that at $$1000~\mathrm{nm}$$ is $$U_3$$. Wien’s constant, $$\mathrm{b}=2.88 \times 10^6 \mathrm{~nm}-\mathrm{K}$$. Which of the following is correct?
1. $$\mathrm{U}_3 =0$$
2. $$\mathrm{U}_1 >\mathrm{U}_2$$
3. $$\mathrm{U}_2 >\mathrm{U}_1$$
4. $$\mathrm{U}_1 =0$$
Subtopic:  Wien's Displacement Law |
64%
From NCERT
NEET - 2016
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On observing light from three different stars $$P$$, $$Q$$, and $$R$$, it was found that the intensity of the violet colour is maximum in the spectrum of $$P$$, the intensity of the green colour is maximum in the spectrum of $$R$$ and the intensity of the red colour is maximum in the spectrum of $$Q$$. If $$T_P$$$$T_Q$$, and $$T_R$$ are the respective absolute temperatures of $$P$$, $$Q$$, and $$R$$, then it can be concluded from the above observations that:
1. $$T_P>T_Q>T_R$$
2. $$T_P>T_R>T_Q$$
3. $$T_P<T_R<T_Q$$
4. $$T_P<T_Q<T_R$$

Subtopic:  Wien's Displacement Law |
65%
From NCERT
NEET - 2015
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A piece of iron is heated in a flame. It first becomes dull red, then becomes reddish yellow and finally turns to white-hot. The correct explanation for the above observation is possible by using:
1. Wien’s displacement Law
2. Kirchoff’s Law
3. Newton’s Law of cooling
4. Stefan’s Law
Subtopic:  Wien's Displacement Law |
82%
From NCERT
AIPMT - 2013
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A black body at 1227 °C emits radiations with maximum intensity at a wavelength of 5000 Å. If the temperature of the body is increased by 1000 °C, the maximum intensity will be observed at:

1. 4000 Å

2. 5000 Å

3. 6000 Å

4. 3000 Å

Subtopic:  Wien's Displacement Law |
57%
From NCERT
AIPMT - 2006
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If λm denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum, then:

1. λm is independent of T

2. λm ∝ T

3. λm ∝ T–1

4. λm ∝ T– 4

Subtopic:  Wien's Displacement Law |
85%
From NCERT
AIPMT - 2004
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Wien's displacement law expresses the relation between:

 1 Wavelength corresponding to maximum energy and temperature 2 Radiation energy and wavelength 3 Temperature and wavelength 4 Colour of light and temperature
Subtopic:  Wien's Displacement Law |
66%
From NCERT
AIPMT - 2002
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A black body has a wavelength ${\lambda }_{m}$ corresponding to maximum energy at 2000 K. Its wavelength corresponding to maximum energy at 3000 K will be:

1. $\frac{3}{2}{\lambda }_{m}$

2. $\frac{2}{3}{\lambda }_{m}$

3. $\frac{16}{81}{\lambda }_{m}$

4. $\frac{81}{16}{\lambda }_{m}$

Subtopic:  Wien's Displacement Law |
80%
From NCERT
AIPMT - 2001
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