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Thermal Properties of Matter · Question 43

AIPMT 2002MCQMedium📈 Topic in 0% papers+4−1
1

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

  1. 304 W
  2. 320 W
  3. 240 W
  4. 120 W

Answer

(2) 320 W

Solution

Net power radiated by a black body in surroundings at T0: P = A(T4 - T04)

T1 = 1000 K, T2 = 1500 K, T0 = 500 K

P2P1 = 15004 - 500410004 - 5004

= 5004(81 - 1)5004(16 - 1) = 8015 = 163

P2 = 60 163 = 320 W

Answer: (2)

AIPMT 2002

Keep practising — Thermal Properties of Matter

2

Which of the following is closest to an ideal black body?

  1. lamp black
  2. cavity maintained at constant temperature
  3. platinum black
  4. a lump of charcoal heated to high temperature.
AIPMT 2002
3

The Wien's displacement law expresses relation between

  1. wavelength corresponding to maximum energy and temperature
  2. radiation energy and wavelength
  3. temperature and wavelength
  4. colour of light and temperature.
AIPMT 2002
4

A cylindrical rod has temperatures T1 and T2 at its ends. The rate of flow of heat is Q1 cal/s. If all the linear dimensions are doubled keeping the temperatures constant, then the rate of flow of heat Q2 will be

  1. 4Q1
  2. 2Q1
  3. Q14
  4. Q12
AIPMT 2001
5

Gravitational force is required for

  1. stirring of liquid
  2. convection
  3. conduction
  4. radiation
AIPMT 2000
6

A black body emits maximum energy at wavelength m at 2000 K. Its corresponding wavelength at 3000 K will be

  1. 32 m
  2. 23 m
  3. 1681 m
  4. 8116 m
AIPMT 2000

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