The heat radiation energy emitted by a 20 cm x 20 cm square plate at a temperature of 527 degrees Celsius is 114.8 Watts. What is the emissivity of the plate? <br />(Stefan-Boltzmann constant = 5.67x10⁸ W/m²K⁴) <br /><br />Watch videos related to MODERN PHYSICS: <br />https://dailymotion.com/playlist/x90qrm
