Question

An object of emissivity 0.9, surface area of 10 cm² and temperature 1000°C are kept in a room temperature of ______. What is the net rate of flow of heat emitted by the object? (Stefan-Boltzmann's constant = 5.67 x 10⁻⁸ W/m²K⁴)

Answer 1

The net rate of heat emitted by the object is 0.0069 W.

Step-by-step explanation:

The net rate of heat emitted by the object can be calculated using the Stefan-Boltzmann law of radiation, which is given by the equation:

P = ωAT₂
where P is the net rate of heat transfer, ω is the emissivity of the object, A is the surface area of the object, and T is the temperature of the object in kelvin.

Substituting the given values into the equation, we get:

P = 5.67 × 10-8 × 0.9 × 10-4 × (1000 + 273)4 = 0.0069 W