A hot plate with area 0.2 m2 is maintained at 60˚C by a 70 W heater when the room is at 20˚C. The convection coefficient is approximated as 2.512(ΔT)1/4. Consider heat loss from plate only due to convection and radiation, percentage heat lost by radiation is_____
1
19.46
2
23.7
3
27.8
4
17.7