An electronic device is to be cooled by natural convection in atmospheric air at . The device generates 50 W internally, and only one of its external surfaces is suitable for attaching fins. The...

An electronic device is to be cooled by natural convection in atmospheric air at . The device generates

50 W internally, and only one of its external surfaces is

suitable for attaching fins. The surface available for

attaching cooling fins is 0.15 m tall and 0.4 m wide.

The maximum length of a fin perpendicular to the surface is limited to 0.02 m, and the temperature at the

base of the fin is not to exceed in one design and