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The power radiated by a black body is P and it radiates maximum energy at wavelength, $λ_{0}$ . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4} λ_{0}$ , the power radiated by it becomes nP. The value of n is

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Important Questions on Heat Transfer

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 1

Spheres

P and Q

are uniformly constructed from the same material which is a good conductor of heat and the radius of

Q

is thrice of radius of

P

. The rate of fall of temperature of

P

x

times that of

Q

when both are at the same surface temperature. The value of

x

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 2

A sphere, a cube and a thin circular plate all made of same substance and all have same mass, These are heated to

200 º C

and then placed in a room, then the

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 3

The power radiated by a black body is

P

, and it radiates maximum energy around the wavelength

λ_{0}

. If the temperature of the black body is now changed, so that, it radiates maximum energy around a wavelength

\frac{3 λ_{0}}{4}

, the power radiated by it will increase by a factor of

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 4

A slab consists of two parallel layers of copper and brass of the same thickness and having thermal conductivities in the ratio

1 : 4

. If the free face of brass is at

100 º C

and that of copper at

0 º C

, the temperature of interface is

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 5

Out of the metal balls of same diameter one is solid and other is hollow. Both are heated to the same temperature at

300 º C

and then allowed to cool in the same surroundings then rate of loss of heat will be

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 6

For a black body at temperature

727 ° C

, its radiating power is

60 W

and the temperature of the surrounding is

227 ° C

. If temperature of black body is changed to

1227^{°} C

, then its radiating power will be

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 7

A body takes

T

minutes to cool from

62 ° C

61 ° C

when the surrounding temperature is

30 ° C

. The time taken by the body to cool from

46 ° C

45.5 ° C

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Analytical Questions)>Q 8

Three discs

A, B

and

C

having radii

2 m, 4 m

and

6 m

respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are

300 nm, 400 nm

and

500 nm

respectively. The power radiated by them are

Q_{A}, Q_{B}

and

Q_{c}

respectively then

The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 34λ0, the power radiated by it becomes nP. The value of n is

Important Questions on Heat Transfer

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The power radiated by a black body is P and it radiates maximum energy at wavelength, $λ_{0}$ . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4} λ_{0}$ , the power radiated by it becomes nP. The value of n is