Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 62

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We consider the radiation emitted by the human body. Which of the following statements is true?

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Important Questions on Heat Transfer

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 63

Shown below are the black body radiation curves at temperatures T₁ and T₂ (T₂ > T₁). Which of the following plots is correct :-

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 64

The radii of two spheres made of same metal are r and 2r. These are heated to the same temperature and placed in the same surrounding. The ratio of rates of decrease of their temperature will be

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 65

If E is the total energy emitted by a body at a temperature TK and

E_{λ m a x}

is the maximum spectral energy emitted by it at the same temperature, then-

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 66

If

e_{λ} a n d a_{λ}

be the emissive power and absorption power respectively of a body and

E_{λ}

be the emissive power of an ideal black body, then from Kirchhoff's laws

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 67

A liquid takes

5 minutes

to cool from

80 ° C

to

50 ° C

. How much time will it take to cool from

60 ° C

to

30 ° C

? The temperature of the surroundings is

20 ° C

.

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 68

A cup of tea cools from

80 ° C

to

60 ° C

is one minute. The ambient temperature is

30 ° C

. In cooling from

60 ° C

to

50 ° C

. It will take :-

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 69

If

λ_{m}

denotes the wavelength at which the radiation emission from a black body at a temperature TK is maximum then:

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 70

A body is in thermal equilibrium with the surrounding: