1. A method for applying RF energy to determine a processing state of an object placed in a cavity having an energy application zone, during processing of the object, the method comprising: applying RF energy to the object during the processing via at least one radiating element; receiving RF feedback from at least one detector connected to the at least one radiating element, said RF feedback being indicative of a dielectric response of the cavity and/or the object to electromagnetic (EM) fields excited in the cavity; mathematically manipulating the RF feedback to obtain computed RF feedback; determining one or more processing states of the object based on a correlation between the computed RF feedback and the one or more processing states of the object; and monitoring the computed RF feedback during the applying to monitor the one or more processing states of the object.