$1.$ Consider a person whose exposed surface area is $1\mathrm{.}5$ m$2,$ emissivity is $0\mathrm{.}45,$ and surface temperature is $34$C$.$ Determine the rate of heat loss from that person by$1.$ Consider a person whose exposed surface area is $1\mathrm{.}5$ m$2,$ emissivity is $0\mathrm{.}45,$ and surface temperature is $34$C$.$ Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of $($a$)293$ K and $($b$)270$ K$.$ radiation in a large room having walls at a temperature of $($a$)293$ K and $($b$)270$ K$.$