Incorporeal Creatures, Damage, and Secondary Effects

[Endarire]

An incorporeal creature normally takes half damage from non-force effects and is only 50% likely to be affected by a non-damaging effect.

An orb of fire (Spell Compendium 151) does d6 fire damage per CL (max 15d6) and forces a Fort save versus dazing.

Would this spell affect ghosts? Can a ghost be dazed by this spell? Is there a 50% chance the ghost won't be dazed if it fails its Fort save?