AIPMT 2002 | Properties of Matter Question 78 | Physics

For a black body at temperature 727^oC, its radiating power is 60 watt and temperature of surrounding is 227^oC. If temperature of black body is changed to 1227^oC then its radiating power will be

304 W

320 W

240 W

120 W

AIPMT 2002

MCQ (Single Correct Answer)

-1

Unit of Stefan's constant is

watt m² K⁴

watt m²/K⁴

watt/m² K

watt/m²K⁴

AIPMT 2001

MCQ (Single Correct Answer)

-1

A cylindrical rod having temperature T₁ and T₂ at its end. The rate of flow of heat Q₁ cal/sec. If all the linear dimension are doubled keeping temperature constant, then rate of flow of heat Q₂ will be

4Q₁

2Q₁

$${{{Q_1}} \over 4}$$

$${{{Q_1}} \over 2}$$

AIPMT 2000

MCQ (Single Correct Answer)

-1

A black body has maximum wavelength $$\lambda $$_m at 2000 K. Its corresponding wavelength at 3000 K will be

$${3 \over 2}{\lambda _m}$$

$${2 \over 3}{\lambda _m}$$

$${{16} \over {81}}{\lambda _m}$$

$${{81} \over {16}}{\lambda _m}$$

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