Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 34

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The temperature of a body is $400 ° C$ . Assuming the surrounding temperature to be negligible, then at what temperature the body will emit double radiation energy?

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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 35

If the temperature of an ideal black body increases by

10 %

, then what will be the percentage increase in the quantity of radiation emitted from its surface?

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 36

The rectangular surface of area

8 cm \times 4 cm

of a black body at a temperature

127 ° C

emits energy at the rate of

E

per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised to

327 ° C

, the rate of emission of energy will become,

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 37

The rate of emission of radiation of a black body at

0 ° C

is

E

, then the rate of emission of radiation of the same black body at

273 ° C

will be

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 38

If a liquid takes

30 s

in cooling from

95 {}^{o}C

to

90 {}^{o}C

and

70 s

in cooling from

55 {}^{o}C

to

50 {}^{o}C

then temperature of room is -

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 39

Newton's law of cooling is used in laboratory for the determination of the

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 40

The $υ_{m} - T$ , curve for a perfect black body is ( $υ_{m} \to$ frequency corresponding to maximum emission of radiation)

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 41

The temperature of a furnace is

2324 ° C

and the intensity is maximum when its radiation spectrum is nearly at

12000 \overset{\circ}{Α}

. lf the intensity in the spectrum of a star is maximum nearly at

4800 \overset{\circ}{A}

, then the surface temperature of star is

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 42

There is a black spot on a body. If the body is heated and carried in dark room, then it glows more. This can be explained on the basis of