An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.
The intensity of the radiation of sunlight at a distance from the Sun of km is measured to be W/m2.
Calculate the radiative power of the Sun.
Calculate the radius of the Sun. Use a value of K for the Sun’s temperature and use a value of 1.0 for the Sun’s emissivity.
A 100-meter-long pipe is at a temperature of . Find the heat loss due from the pipe due to radiation if the pipe’s outer diameter is 10 cm. The surface emissivity of the pipe is 0.7.