A solid cylinder of radius r₁ =2.5 cm, length h₁ =5.0 cm, emissivity 0.85, and temperature 30°C is suspended in an environment of temperature 50°C. (a) What is the cylinder’s net thermal radiation transfer rate P₁? (b) If the cylinder is stretched until its radius is r₂ =0.50 cm, its net thermal radiation transfer rate becomes P₂.What is the ratio P₂/P₁?