Find the heat radiated per second by a body of surface area $12 c m^{2}$ kept in thermal equilibrium in a room at temperature $20^{o} C$ . The emissivity of the surface is $0.8$ and $σ = 6 \times 10^{- 8} W m^{- 2} K^{- 4}$ .

4.2 J

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0.42 J

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0.042 J

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42 J

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Solution

The correct option is B 0.42 J
Energy radiated per second $P = e A σ T^{4} = 0.8 \times 12 \times 10^{- 4} \times 6 \times 10^{- 8} \times (293)^{4} = 0.42 J$

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Calculate the amount of heat radiated per second by a body of surface area 12 $c m^{2}$ kept in thermal equilibrium in a room at temperature $20^{0}$ C. The emissivity of the surface = 0.80 and $σ = 6.0 \times 10^{- 8} W m^{- 2} K^{- 4}$

Q. Calculate the amount of heat radiated per second by a body of surface area

12 {c m}^{2}

kept in thermal equilibrium in a room temperature

20^{o} C

. The emissivity of the surface

= 0.80

and

σ = 6.0 \times 10^{- 8} W / m^{2} - K^{4}

Assume that the total surface area of a human body is 1.6 $m^{2}$ and that it radiates like an ideal radiator. Calculate the amount of enrgy radiated per second by the body if the body temperature is $37^{0}$ C. Stefan constant $σ$ is $6.0 \times 10^{- 8} W m^{- 2} K^{- 4}$ .

Q. Assume that the total surface area of a human body is 1.6 m² and that it radiates like an ideal radiator. Calculate the amount of energy radiated per second by the body if the body temperature is 37°C. Stefan constant σ is 6.0 × 10⁻⁸ W m⁻² K⁻⁴.

Q. An electric heater of power

1 kW

emits thermal radiations. The surface area of the heating element of the heater is

200 {cm}^{2}

. If this heating element is treated like a black body, find the temperature at its surface. Assume its temperature is very much higher than its surroundings.
[

σ = 5.67 \times 10^{- 8} {W m}^{- 2} K^{- 4}

]

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Find the heat radiated per second by a body of surface area 12cm2 kept in thermal equilibrium in a room at temperature 20oC. The emissivity of the surface is 0.8 and σ=6×10−8Wm−2K−4.

The correct option is B 0.42 JEnergy radiated per second P=eAσT4=0.8×12×10−4×6×10−8×(293)4=0.42J

Find the heat radiated per second by a body of surface area $12 c m^{2}$ kept in thermal equilibrium in a room at temperature $20^{o} C$ . The emissivity of the surface is $0.8$ and $σ = 6 \times 10^{- 8} W m^{- 2} K^{- 4}$ .

The correct option is B 0.42 J
Energy radiated per second $P = e A σ T^{4} = 0.8 \times 12 \times 10^{- 4} \times 6 \times 10^{- 8} \times (293)^{4} = 0.42 J$