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The power radiated by a black body is \(P\) and it radiates maximum energy at wavelength ${}_{}$\(\lambda_0\)

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 spherical black body with a radius of 12 cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watts would be:

1. | 225 | 2. | 450 |

3. | 1000 | 4. | 1800 |

Subtopic: Stefan-Boltzmann Law |

74%

From NCERT

NEET - 2017

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Two rods \(A\) and \(B\) of different materials are welded together as shown in the figure. Their thermal conductivities are \(K_1\) and \(K_2.\) The thermal conductivity of the composite rod will be:

** **

1. \(\frac{3(K_1+K_2)}{2}\)

2. \(K_1+K_2\)

3. \(2(K_1+K_2)\)

4. \(\frac{(K_1+K_2)}{2}\)

Subtopic: Conduction |

70%

From NCERT

NEET - 2017

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A piece of ice falls from a height \(h\) so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice, and all energy of ice gets converted into heat during its fall. The value of \(h\) is: (Latent heat of ice is \(3.4\times10^5\) J/kg and \(g=10\) N/kg)

1. | \(544\) km | 2. | \(136\) km |

3. | \(68\) km | 4. | \(34\) km |

Subtopic: Calorimetry |

75%

From NCERT

NEET - 2016

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Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at \(100~^{\circ}\mathrm{C}\), while the other one is at \(0~^{\circ}\mathrm{C}.\) If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is:

1. | \(50~^{\circ}\mathrm{C}\) |

2. | \(50~^{\circ}\mathrm{C}\) | more than

3. | \(50~^{\circ}\mathrm{C}\) but greater than \(0~^{\circ}\mathrm{C}\) | less than

4. | \(0~^{\circ}\mathrm{C}\) |

Subtopic: Calorimetry |

65%

From NCERT

NEET - 2016

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A body cools from a temperature of \(3T\) to \(2T\) in \(10\) minutes. The room temperature is \(T\). Assuming that Newton's law of cooling is applicable, the temperature of the body at the end of the next \(10\) minutes will be:

1. \(\frac{7}{4}T\)

2. \(\frac{3}{2}T\)

3. \(\frac{4}{3}T\)

4. \(T\)

Subtopic: Newton's Law of Cooling |

72%

From NCERT

NEET - 2016

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The coefficient of linear expansion of brass and steel rods are \(\alpha_1\) and \(\alpha_2\). Lengths of brass and steel rods are \(L_1\) and \(L_2\) respectively. If \((L_2-L_1)\) remains the same at all temperatures, which one of the following relations holds good?

1. \(\alpha_1L_2^2=\alpha_2L_1^2\)

2. \(\alpha_1^2L_2=\alpha_2^2L_1\)

3. \(\alpha_1L_1=\alpha_2L_2\)

4. \(\alpha_1L_2=\alpha_2L_1\)

Subtopic: Thermal Expansion |

88%

From NCERT

NEET - 2016

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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. \(\mathrm{U}_1 =0\)

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 |

66%

From NCERT

NEET - 2016

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A piece of ice falls from a height \(h\) so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice. The value of \(h\) is:

[Latent heat of ice is \(3.4 \times 10^5~\mathrm{~J/kg}\) and \(g=10~\mathrm{N/kg}\)]

1. \(544~\mathrm{km}\)

2. \(136~\mathrm{km}\)

3. \(68~\mathrm{km}\)

4. \(34~\mathrm{km}\)

2. \(136~\mathrm{km}\)

3. \(68~\mathrm{km}\)

4. \(34~\mathrm{km}\)

Subtopic: Calorimetry |

81%

From NCERT

NEET - 2016

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